How To Fix WG307 - Purchase order not created for supplier &1 &2 as one already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: WG - Messages for store order and investment buy

• Message number: 307

• Message text: Purchase order not created for supplier &1 &2 as one already exists

What causes this issue?

A purchase order could not be created for the supplier as a purchase
order already exists.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WG307 - Purchase order not created for supplier &1 &2 as one already exists ?

  Certainly! Here's a detailed explanation for the SAP error message WG307:
  
  SAP Error Message: WG307
  Text: Purchase order not created for supplier &1 &2 as one already exists
  
  Cause:
  This error occurs when you attempt to create a purchase order (PO) for a supplier, but the system detects that a purchase order for the same supplier and the same purchasing document already exists. SAP prevents the creation of duplicate purchase orders for the same supplier and document combination to avoid redundancy and potential conflicts in procurement processing.
  In other words, the system is designed to avoid multiple purchase orders being created for the same supplier under the same conditions, which could lead to confusion or duplicate orders.
  
  Explanation of the placeholders:
  
  &1 = Supplier number (Vendor number)
  &2 = Purchase order number or purchasing document number that already exists
  
  
  Typical Scenarios Leading to This Error:
  
  Trying to create a new PO for a supplier when a PO for the same supplier and purchasing document already exists.
  A user attempts to create a PO manually or via a program that does not check for existing POs.
  Integration or interface issues where duplicate PO creation requests are sent.
  
  
  Solution:
  
  
  Check Existing Purchase Orders:
  
  Use transaction ME23N (Display Purchase Order) or ME2N (Purchase Orders by Vendor) to check if a PO already exists for the supplier &1 and document &2.
  Confirm if the existing PO meets the requirements or if it can be modified instead of creating a new one.
  
  
  
  Avoid Duplicate Creation:
  
  If a PO already exists, use the existing PO for further processing.
  If changes are needed, modify the existing PO rather than creating a new one.
  
  
  
  Review the Process or Program:
  
  If the PO creation is automated (e.g., via EDI, IDoc, or custom programs), ensure the logic checks for existing POs before attempting to create a new one.
  Implement or fix duplicate checks in the program or interface.
  
  
  
  Consult with Procurement Team:
  
  Sometimes, business rules may require multiple POs for the same supplier but different conditions. Confirm with procurement if the existing PO can be reused or if a new PO is justified.
  
  
  
  SAP Notes and Support:
  
  Check SAP Notes for any known issues related to WG307.
  If the problem persists and is not due to user error, consider raising a support ticket with SAP.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  ME21N – Create Purchase Order
  ME22N – Change Purchase Order
  ME23N – Display Purchase Order
  ME2N – Purchase Orders by Vendor
  
  
  
  Tables:
  
  EKKO – Purchase Order Header
  EKPO – Purchase Order Item
  
  
  
  Common SAP Modules Involved:
  
  MM (Materials Management)
  SRM (Supplier Relationship Management), if integrated
  
  
  
  Additional Tips:
  
  Always ensure master data (vendor, purchasing info records) is consistent.
  Check for any user exits or BAdIs that might affect PO creation logic.
  
  
  
  
  If you provide more context (e.g., transaction used, whether this is manual or automated PO creation), I can help tailor the solution further.