How To Fix QF155 - Serial number &1 can no longer be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: QF - Defects Recording

• Message number: 155

• Message text: Serial number &1 can no longer be changed

What causes this issue?

You can no longer delete the serial number &v1& from the object list for
inspection lot &v2&, because defects or results have already been
recorded for this serial number.

System Response

You can only delete the serial number, if no defects or single values
are assigned to this serial number in inspection lot &v2&.

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

How to fix this error?

If you want to delete the serial number, you should delete the defects
recorded for this serial number and set the attribute for the single
value to invalid.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message QF155 - Serial number &1 can no longer be changed ?

  The SAP error message QF155, which states "Serial number &1 can no longer be changed," typically occurs in the context of handling serial numbers in the SAP system, particularly in modules related to inventory management, production, or sales and distribution. This error indicates that the system has determined that the serial number in question is in a state where it cannot be modified.
  Causes:
  
  
  Status of the Serial Number: The serial number may have been assigned to a document (like a delivery, production order, or sales order) that has already been processed or completed. Once a serial number is assigned and the document is finalized, changes to the serial number are often restricted.
  
  
  Document Flow: If the serial number is linked to a document that has been posted (e.g., goods issue, delivery, invoice), the system locks the serial number to maintain data integrity.
  
  
  Configuration Settings: Certain configuration settings in the SAP system may restrict changes to serial numbers after specific transactions have been completed.
  
  
  Solutions:
  
  
  Check Document Status: Review the status of the document associated with the serial number. If the document is completed or posted, you may need to reverse or cancel the document before making changes to the serial number.
  
  
  Use Transaction Codes: Utilize transaction codes like IQ02 (Change Serial Number) or IQ01 (Create Serial Number) to check the status of the serial number and see if it can be modified.
  
  
  Review Serial Number Assignment: Ensure that the serial number is not assigned to any other documents or processes that would prevent changes. If it is, you may need to unassign it first.
  
  
  Consult Configuration: If you have access to the configuration settings, check if there are any rules or settings that prevent changes to serial numbers after certain transactions. Adjust these settings if necessary, but be cautious as this may affect other processes.
  
  
  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:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context.
  Documentation: Review the SAP documentation related to serial number management and the specific module you are working with (e.g., MM, SD, PP).
  User Permissions: Ensure that you have the necessary permissions to make changes to serial numbers 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.