Su Template de datos de Purchase to Pay - Requisition

This extraction is configured within the Coupa UI and does not use a direct script. The following outlines the objects and fields required to build the report, which is then transformed into an event log.

**Data Sources (Objects to Join):**
1.  `Requisition Headers` (Primary)
2.  `Approvals` (Joined on Requisition Header ID)
3.  `Users` (Joined from `Requisition Headers` for Requester details)
4.  `Users` (Joined from `Approvals` for Approver details)
5.  `Purchase Order Headers` (Joined on Requisition Header ID)

**Report Columns Configuration (Fields to Select):**

*   **For 'Requisition Created' event:**
    *   Source Object: `Requisition Headers`
    *   Source Field: `Requisition #` -> Maps to `PurchaseRequisitionId`
    *   Source Field: `Created At` -> Maps to `EventTime`

*   **For 'Requisition Submitted' event:**
    *   Source Object: `Requisition Headers`
    *   Source Field: `Submitted At` -> Maps to `EventTime`

*   **For 'Requisition Amended' event:**
    *   Source Object: `Requisition Headers`
    *   Source Field: `Updated At` -> Maps to `EventTime` (Logic must be applied to identify updates after submission)

*   **For 'Approval Step Started' event:**
    *   Source Object: `Approvals`
    *   Source Field: `Created At` -> Maps to `EventTime`

*   **For 'Approval Step Approved' / 'Approval Step Rejected' events:**
    *   Source Object: `Approvals`
    *   Source Field: `Updated At` -> Maps to `EventTime`
    *   Source Field: `Status` -> Used to determine `ActivityName` ('Approved' or 'Rejected')

*   **For 'Requisition Withdrawn' / 'Requisition Approved' / 'Requisition Rejected' / 'Requisition Closed' events:**
    *   Source Object: `Requisition Headers`
    *   Source Field: `Updated At` -> Maps to `EventTime`
    *   Source Field: `Status` -> Used to determine `ActivityName`

*   **For 'Requisition Sourced' event:**
    *   Source Object: `Requisition Headers`
    *   Source Field: `Updated At` -> Maps to `EventTime`
    *   Source Field: `Sourced Externally?` -> Used in logic to identify this event

*   **For 'Purchase Order Created' event:**
    *   Source Object: `Purchase Order Headers`
    *   Source Field: `Created At` -> Maps to `EventTime`

*   **For General Attributes:**
    *   `Requisition Headers | Requisition #` -> `PurchaseRequisitionId`
    *   `Requisition Headers | Status` -> `RequisitionStatus`
    *   `Requisition Headers | Created By (Full Name)` -> `Requester`
    *   `Requisition Headers | Account Department` -> `Department`
    *   `Requisition Headers | Total` -> `TotalAmount`
    *   `Approvals | Approver (Full Name)` -> `Approver`

import requests
import pandas as pd
from datetime import datetime, timezone

class=class="hl-string">"hl-comment"># --- Configuration ---
class=class="hl-string">"hl-comment"># Replace with your Coupa instance URL and API Key
COUPA_INSTANCE_URL = class="hl-string">"https://[your_instance].coupahost.com"
API_KEY = class="hl-string">"[your_api_key]"

class=class="hl-string">"hl-comment"># --- Main Extraction Logic ---

def get_coupa_data(endpoint, params={}):
    class="hl-string">"""Fetches paginated data from a Coupa API endpoint."""
    headers = {
        class="hl-string">"Accept": class="hl-string">"application/json",
        class="hl-string">"X-COUPA-API-KEY": API_KEY
    }
    
    all_records = []
    offset = 0
    limit = 50
    
    while True:
        paginated_params = params.copy()
        paginated_params[class="hl-string">'offset'] = offset
        paginated_params[class="hl-string">'limit'] = limit
        
        try:
            response = requests.get(fclass="hl-string">"{COUPA_INSTANCE_URL}{endpoint}", headers=headers, params=paginated_params)
            response.raise_for_status() class=class="hl-string">"hl-comment"># Raises an exception for 4xx/5xx errors
            data = response.json()
            
            if not data:
                break
                
            all_records.extend(data)
            offset += limit
        except requests.exceptions.RequestException as e:
            print(fclass="hl-string">"Error fetching data from {endpoint}: {e}")
            break
            
    return all_records

def main(start_date, end_date):
    class="hl-string">"""Main function to extract, transform, and save the event log.""" 
    print(class="hl-string">"Starting Coupa Requisition data extraction...")
    
    event_log = []
    current_time_utc = datetime.now(timezone.utc).isoformat()

    class=class="hl-string">"hl-comment"># 1. Fetch Requisition Headers within the date range
    req_params = {
        class="hl-string">"created-at[gt]": start_date,
        class="hl-string">"created-at[lt]": end_date,
        class="hl-string">"fields": class="hl-string">'["id", "created-at", "submitted-at", "updated-at", "version", "status", "total", "requester", "currency", "sourcing-event-id"]'
    }
    requisition_headers = get_coupa_data(class="hl-string">"/api/requisition_headers", req_params)
    print(fclass="hl-string">"Found {len(requisition_headers)} requisitions to process.")

    for i, header in enumerate(requisition_headers):
        print(fclass="hl-string">"Processing requisition {i+1}/{len(requisition_headers)}: ID {header['id']}")
        
        class=class="hl-string">"hl-comment"># Common attributes for all events of this case
        case_id = str(header[class="hl-string">'id'])
        total_amount = header.get(class="hl-string">'total', {}).get(class="hl-string">'total')
        requester_name = fclass="hl-string">"{header.get('requester', {}).get('firstname', '')} {header.get('requester', {}).get('lastname', '')}".strip()
        department_name = header.get(class="hl-string">'requester', {}).get(class="hl-string">'department', {}).get(class="hl-string">'name')

        base_event = {
            class="hl-string">"PurchaseRequisitionId": case_id,
            class="hl-string">"TotalAmount": total_amount,
            class="hl-string">"Requester": requester_name,
            class="hl-string">"Department": department_name,
            class="hl-string">"Approver": None,
            class="hl-string">"SourceSystem": class="hl-string">"Coupa",
            class="hl-string">"LastDataUpdate": current_time_utc
        }

        class=class="hl-string">"hl-comment"># Activity: Requisition Created
        event_log.append({
            **base_event,
            class="hl-string">"ActivityName": class="hl-string">"Requisition Created",
            class="hl-string">"EventTime": header[class="hl-string">'created-at'],
            class="hl-string">"RequisitionStatus": class="hl-string">"draft"
        })

        class=class="hl-string">"hl-comment"># Activity: Requisition Submitted
        if header.get(class="hl-string">'submitted-at'):
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Submitted",
                class="hl-string">"EventTime": header[class="hl-string">'submitted-at'],
                class="hl-string">"RequisitionStatus": class="hl-string">"pending_approval"
            })

        class=class="hl-string">"hl-comment"># Activity: Requisition Amended
        if header.get(class="hl-string">'version') and int(header[class="hl-string">'version']) > 1:
             event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Amended",
                class="hl-string">"EventTime": header[class="hl-string">'updated-at'], class=class="hl-string">"hl-comment"># Timestamp of the new version
                class="hl-string">"RequisitionStatus": header[class="hl-string">'status']
            })

        class=class="hl-string">"hl-comment"># 2. Fetch Approvals for this requisition
        approval_params = {
            class="hl-string">"approvable-id": header[class="hl-string">'id'],
            class="hl-string">"approvable-type": class="hl-string">"RequisitionHeader"
        }
        approvals = get_coupa_data(class="hl-string">"/api/approvals", approval_params)

        for approval in approvals:
            approver = approval.get(class="hl-string">'approver', {}).get(class="hl-string">'fullname')
            approval_status = approval[class="hl-string">'status']

            class=class="hl-string">"hl-comment"># Activity: Approval Step Started
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Approval Step Started",
                class="hl-string">"EventTime": approval[class="hl-string">'created-at'],
                class="hl-string">"RequisitionStatus": class="hl-string">"pending_approval",
                class="hl-string">"Approver": approver
            })

            if approval_status == class="hl-string">'approved':
                class=class="hl-string">"hl-comment"># Activity: Approval Step Approved
                event_log.append({
                    **base_event,
                    class="hl-string">"ActivityName": class="hl-string">"Approval Step Approved",
                    class="hl-string">"EventTime": approval[class="hl-string">'updated-at'],
                    class="hl-string">"RequisitionStatus": class="hl-string">"pending_approval",
                    class="hl-string">"Approver": approver
                })
            elif approval_status == class="hl-string">'rejected':
                class=class="hl-string">"hl-comment"># Activity: Approval Step Rejected
                event_log.append({
                    **base_event,
                    class="hl-string">"ActivityName": class="hl-string">"Approval Step Rejected",
                    class="hl-string">"EventTime": approval[class="hl-string">'updated-at'],
                    class="hl-string">"RequisitionStatus": class="hl-string">"pending_approval",
                    class="hl-string">"Approver": approver
                })
        
        class=class="hl-string">"hl-comment"># 3. Handle final status and related events
        final_status_event_time = header[class="hl-string">'updated-at']
        final_status = header[class="hl-string">'status']

        if final_status == class="hl-string">'approved':
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Approved",
                class="hl-string">"EventTime": final_status_event_time,
                class="hl-string">"RequisitionStatus": final_status
            })
        elif final_status == class="hl-string">'rejected':
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Rejected",
                class="hl-string">"EventTime": final_status_event_time,
                class="hl-string">"RequisitionStatus": final_status
            })
        elif final_status == class="hl-string">'withdrawn':
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Withdrawn",
                class="hl-string">"EventTime": final_status_event_time,
                class="hl-string">"RequisitionStatus": final_status
            })
        elif final_status == class="hl-string">'closed':
             event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Closed",
                class="hl-string">"EventTime": final_status_event_time,
                class="hl-string">"RequisitionStatus": final_status
            })

        class=class="hl-string">"hl-comment"># Activity: Requisition Sourced
        if header.get(class="hl-string">'sourcing-event-id'):
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Requisition Sourced",
                class="hl-string">"EventTime": final_status_event_time, class=class="hl-string">"hl-comment"># Assumes status update time reflects sourcing
                class="hl-string">"RequisitionStatus": final_status
            })

        class=class="hl-string">"hl-comment"># 4. Fetch Purchase Orders to detect PO Creation
        po_params = {class="hl-string">"requisition-header-id": header[class="hl-string">'id']}
        purchase_orders = get_coupa_data(class="hl-string">"/api/purchase_orders", po_params)

        for po in purchase_orders:
            event_log.append({
                **base_event,
                class="hl-string">"ActivityName": class="hl-string">"Purchase Order Created",
                class="hl-string">"EventTime": po[class="hl-string">'created-at'],
                class="hl-string">"RequisitionStatus": class="hl-string">"ordered" 
            })

    class=class="hl-string">"hl-comment"># 5. Create and save the DataFrame
    if not event_log:
        print(class="hl-string">"No events were generated. The output file will be empty.")
        return

    df = pd.DataFrame(event_log)
    df = df.sort_values(by=[class="hl-string">"PurchaseRequisitionId", class="hl-string">"EventTime"])
    df.to_csv(class="hl-string">"coupa_requisition_event_log.csv", index=False)
    print(class="hl-string">"\nExtraction complete. Event log saved to coupa_requisition_event_log.csv")

if __name__ == class="hl-string">"__main__":
    class=class="hl-string">"hl-comment"># Define the extraction period. Format: YYYY-MM-DDTHH:MM:SSZ
    START_DATE = class="hl-string">"2023-01-01T00:00:00Z"
    END_DATE = class="hl-string">"2023-06-30T23:59:59Z"
    main(START_DATE, END_DATE)

WITH
requisition_created AS (
    SELECT
        CAST(r.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Created' AS ActivityName,
        CAST(r.created_at AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(r.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(NULL AS VARCHAR(255)) AS Approver
    FROM [Your requisition header object] r
    WHERE r.created_at >= CAST('[Your start date]' AS TIMESTAMP)
      AND r.created_at < CAST('[Your end date]' AS TIMESTAMP)
      AND [Your company filter]
),
requisition_submitted AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Submitted' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.previous_status AS VARCHAR(255))) = 'draft'
      AND LOWER(CAST(h.new_status AS VARCHAR(255))) = 'pending_approval'
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_amended AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Amended' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.event_type AS VARCHAR(255))) IN ('amended', 'updated', 'version_created')
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
),
approval_step_started AS (
    SELECT
        CAST(a.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Approval Step Started' AS ActivityName,
        CAST(a.created_at AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(a.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(a.approver AS VARCHAR(255)) AS Approver
    FROM [Your approval object] a
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(a.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(a.status AS VARCHAR(255))) = 'pending'
      AND a.created_at >= CAST('[Your start date]' AS TIMESTAMP)
      AND a.created_at < CAST('[Your end date]' AS TIMESTAMP)
),
approval_step_approved AS (
    SELECT
        CAST(a.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Approval Step Approved' AS ActivityName,
        CAST(a.action_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(a.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(a.approver AS VARCHAR(255)) AS Approver
    FROM [Your approval object] a
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(a.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(a.action AS VARCHAR(255))) = 'approved'
      AND a.action_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND a.action_time < CAST('[Your end date]' AS TIMESTAMP)
),
approval_step_rejected AS (
    SELECT
        CAST(a.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Approval Step Rejected' AS ActivityName,
        CAST(a.action_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(a.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(a.approver AS VARCHAR(255)) AS Approver
    FROM [Your approval object] a
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(a.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(a.action AS VARCHAR(255))) = 'rejected'
      AND a.action_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND a.action_time < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_withdrawn AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Withdrawn' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.event_type AS VARCHAR(255))) IN ('withdrawn', 'withdrawal', 'cancelled_before_approval')
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_approved AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Approved' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.new_status AS VARCHAR(255))) = 'approved'
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_rejected AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Rejected' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.new_status AS VARCHAR(255))) = 'rejected'
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_sourced AS (
    SELECT
        CAST(s.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Sourced' AS ActivityName,
        CAST(s.created_at AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(s.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(NULL AS VARCHAR(255)) AS Approver
    FROM [Your sourcing relationship object] s
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(s.requisition_id AS VARCHAR(255))
    WHERE s.created_at >= CAST('[Your start date]' AS TIMESTAMP)
      AND s.created_at < CAST('[Your end date]' AS TIMESTAMP)
),
purchase_order_created AS (
    SELECT
        CAST(p.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Purchase Order Created' AS ActivityName,
        CAST(p.created_at AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(p.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(NULL AS VARCHAR(255)) AS Approver
    FROM [Your purchase order relationship object] p
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(p.requisition_id AS VARCHAR(255))
    WHERE p.created_at >= CAST('[Your start date]' AS TIMESTAMP)
      AND p.created_at < CAST('[Your end date]' AS TIMESTAMP)
),
requisition_closed AS (
    SELECT
        CAST(h.requisition_id AS VARCHAR(255)) AS PurchaseRequisitionId,
        'Requisition Closed' AS ActivityName,
        CAST(h.event_time AS TIMESTAMP) AS EventTime,
        'Coupa' AS SourceSystem,
        CAST(h.last_data_update AS TIMESTAMP) AS LastDataUpdate,
        CAST(r.status AS VARCHAR(255)) AS RequisitionStatus,
        CAST(r.requester AS VARCHAR(255)) AS Requester,
        CAST(r.department AS VARCHAR(255)) AS Department,
        CAST(r.total_amount AS DECIMAL(38, 10)) AS TotalAmount,
        CAST(h.user_name AS VARCHAR(255)) AS Approver
    FROM [Your requisition history or audit object] h
    LEFT JOIN [Your requisition header object] r ON CAST(r.requisition_id AS VARCHAR(255)) = CAST(h.requisition_id AS VARCHAR(255))
    WHERE LOWER(CAST(h.event_type AS VARCHAR(255))) IN ('closed', 'closure', 'cancelled_after_approval')
      AND h.event_time >= CAST('[Your start date]' AS TIMESTAMP)
      AND h.event_time < CAST('[Your end date]' AS TIMESTAMP)
)
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_created
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_submitted
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_amended
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM approval_step_started
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM approval_step_approved
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM approval_step_rejected
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_withdrawn
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_approved
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_rejected
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_sourced
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM purchase_order_created
UNION ALL
SELECT PurchaseRequisitionId, ActivityName, EventTime, SourceSystem, LastDataUpdate, RequisitionStatus, Requester, Department, TotalAmount, Approver FROM requisition_closed
ORDER BY PurchaseRequisitionId, EventTime, ActivityName;