How To Fix M3688 - Supplier can no longer be changed

M3688 - Overview

• 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