How To Fix WP634 - Purchase order generation for material &1, as no open PO can be found

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 634

• Message text: Purchase order generation for material &1, as no open PO can be found

What causes this issue?

The system could not find any open purchase order items for material
&V1& using the existing information on goods receipt items.

System Response

The system automatically creates a purchase order for material &V1& for
this goods receipt item and post the goods receipt, creating a
reference to this purchase order item.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP634 - Purchase order generation for material &1, as no open PO can be found ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WP634 - Purchase order generation for material &1, as no open PO can be found
  
  Meaning / Cause:
  This error occurs during the process of purchase order (PO) generation, typically in the context of production order or process order confirmation, or when trying to create a purchase requisition or PO automatically.
  
  The system tries to find an open purchase order for the specified material (material number &1).
  However, no open purchase order exists for that material in the system.
  This situation can arise if:
  
  No purchase order has been created yet for the material.
  Existing purchase orders for the material are already closed, fully delivered, or deleted.
  The system is configured to look for an open PO to link or reference, but none is available.
  The material master or procurement settings do not allow automatic PO creation or linking.
  
  
  
  
  When does it typically occur?
  
  During automatic PO generation from production or process orders.
  When confirming production orders that require components to be procured externally.
  When using MIGO or MB31 for goods receipt referencing a PO that is expected but not found.
  In MRP runs or automatic purchase requisition/PO creation processes.
  
  
  Solution / How to resolve:
  
  
  Check if a Purchase Order exists for the material:
  
  Use transaction ME23N or ME2M to check if there are any open purchase orders for the material.
  If no PO exists, create a new purchase order manually or via automatic PO creation.
  
  
  
  Check the status of existing POs:
  
  Verify if existing POs are closed, fully delivered, or blocked.
  If so, create a new PO or reopen the PO if appropriate.
  
  
  
  Review procurement settings:
  
  Check the material master (MM03) under the Purchasing view to ensure the material is set up for external procurement.
  Verify the MRP type and Procurement type (field BESKZ) to confirm if automatic PO creation is allowed.
  
  
  
  Check configuration for automatic PO generation:
  
  Review the settings in SPRO under Materials Management ? Purchasing ? Purchase Order ? Automatic PO generation.
  Ensure the system is correctly configured to create or link POs for the material.
  
  
  
  If the error occurs during production order confirmation:
  
  Check the component assignment and procurement type in the BOM and routing.
  Confirm if the system expects an open PO for components procured externally.
  If no PO exists, create one or adjust the process to allow creation.
  
  
  
  Check user exit or custom code:
  
  Sometimes custom enhancements or user exits may enforce PO existence.
  Review any custom logic that might cause this error.
  
  
  
  
  Additional Information:
  
  Message Class: WP6 (related to production and procurement processes)
  Transaction codes involved: ME21N (Create PO), ME23N (Display PO), CO11N (Confirm production order), MD04 (Stock/Requirements List)
  Related SAP Notes: Check SAP OSS notes for any known bugs or patches related to WP634.
  Logs and Traces: Use transaction ST22 (dump analysis) or SM21 (system log) if the error causes dumps or system issues.
  
  
  Summary:
  The error WP634 indicates that the system expected to find an open purchase order for the specified material but none was found. The solution involves verifying the existence and status of purchase orders for the material, ensuring procurement settings are correct, and creating or reopening purchase orders as needed.
  
  If you provide the exact context or transaction where this error occurs, I can help with more specific troubleshooting steps.