How To Fix WP618 - Supplier & from original purchase order cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 618

• Message text: Supplier & from original purchase order cannot be changed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WP618 - Supplier & from original purchase order cannot be changed ?

  The SAP error message WP618: "Supplier & from original purchase order cannot be changed" typically occurs in the context of purchase order (PO) processing, especially when you try to change the supplier on a PO or a related document where the supplier is not allowed to be changed.
  
  Cause
  
  The error arises because the supplier/vendor assigned to the original purchase order cannot be changed once the PO has been created and certain subsequent processes have been performed.
  This restriction exists to maintain data consistency and integrity in procurement processes.
  For example, if you try to change the supplier on a PO that already has goods receipts, invoice receipts, or is referenced in other documents (like contracts, scheduling agreements, or purchase requisitions), SAP prevents this change.
  The system enforces that the supplier/vendor remains the same to avoid inconsistencies in delivery, invoicing, and payment processes.
  
  
  When does this error typically occur?
  
  When attempting to change the supplier/vendor on an existing PO.
  When copying or referencing an original PO and trying to assign a different supplier.
  During PO change transactions (ME22N) if the supplier field is modified.
  When creating a follow-on document (like a contract or scheduling agreement) and trying to assign a different supplier than the original PO.
  
  
  Solution
  
  
  Do not change the supplier/vendor on the existing PO.
  
  If the supplier needs to be changed, the recommended approach is to:
  
  Create a new purchase order with the correct supplier.
  Cancel or close the original PO if it is no longer needed.
  
  
  
  Check the document flow and status:
  
  Verify if goods receipts, invoice receipts, or other follow-on documents exist for the PO.
  If such documents exist, supplier change is not allowed.
  
  
  
  If the supplier must be changed and no follow-on documents exist:
  
  You may delete the PO and recreate it with the correct supplier (if allowed by your business process).
  Or, if the PO is not yet processed, you might be able to change the supplier in ME22N, but only if no dependent documents exist.
  
  
  
  Consult your procurement or SAP MM team to understand the business impact and follow the organizational process for supplier changes.
  
  
  
  Related Information
  
  Transaction codes: ME21N (Create PO), ME22N (Change PO), ME23N (Display PO)
  SAP module: Materials Management (MM) - Purchasing
  SAP Notes: Sometimes SAP Notes provide additional guidance if this error occurs due to system bugs or specific scenarios.
  Business process: Supplier/vendor is a key master data in procurement and is linked to pricing, delivery, and payment terms. Changing it arbitrarily can cause inconsistencies.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error message
  WP618: Supplier & from original purchase order cannot be changed
  
  
  Cause
  Attempt to change supplier/vendor on a PO that already has follow-on documents or is locked for supplier changes
  
  
  Solution
  Do not change supplier on existing PO; create a new PO if supplier must be different
  
  
  Related SAP module
  MM (Materials Management) - Purchasing
  
  
  Transactions
  ME21N, ME22N, ME23N
  
  
  
  
  If you need further assistance, please provide details such as the transaction you are using, the document type, and the current status of the PO.