How To Fix M3688 - Supplier can no longer be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 688

• Message text: Supplier can no longer be changed

What causes this issue?

You have attempted to change the supplier although goods have already
been received for this batch. The field for the last goods receipt is
filled.

System Response

The change is cancelled by the system since it is not allowed.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3688 - Supplier can no longer be changed ?

  The SAP error message M3688 ("Supplier can no longer be changed") typically occurs in the context of materials management, particularly when dealing with purchasing documents or material master records. This error indicates that the supplier information for a specific material or purchasing document cannot be modified due to certain restrictions or conditions.
  Causes:
  
  
  Document Status: The purchasing document (like a purchase order) may be in a status that does not allow changes. For example, if the document is already confirmed or has been partially delivered, changes to the supplier may be restricted.
  
  
  Material Master Data: The material master record may have been flagged or set up in a way that prevents changes to the supplier information. This could be due to settings in the material type or purchasing organization.
  
  
  Vendor Block: The vendor may be blocked for purchasing transactions, which would prevent any changes to the supplier information.
  
  
  Transaction Type Restrictions: Certain transaction types may have restrictions on changing supplier information based on business rules or configurations.
  
  
  Document Type: The type of document you are trying to change may have specific rules that prevent supplier changes.
  
  
  Solutions:
  
  
  Check Document Status: Review the status of the purchasing document. If it is in a status that does not allow changes, you may need to cancel or reverse the document before making changes.
  
  
  Review Material Master: Check the material master record for any settings that may prevent changes to the supplier. You can do this by navigating to the material master transaction (MM03) and reviewing the relevant views.
  
  
  Vendor Status: Verify the status of the vendor in the vendor master record (transaction code XK03). Ensure that the vendor is not blocked for purchasing.
  
  
  Consult Configuration: If you have access to configuration settings, check the settings for the material type and purchasing organization to see if there are any restrictions on changing suppliers.
  
  
  Use Alternative Documents: If the document type you are using does not allow changes, consider creating a new document with the correct supplier information.
  
  
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting the SAP Help Portal for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME22N (Change Purchase Order), ME23N (Display Purchase Order), and MM03 (Display Material).
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide specific fixes or workarounds.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to supplier information in the system.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.