How To Fix /SCWM/BIF_TAPP000 - Access to TU assignment &1 only possible with valid external lock

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/BIF_TAPP -

• Message number: 000

• Message text: Access to TU assignment &1 only possible with valid external lock

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/BIF_TAPP000 - Access to TU assignment &1 only possible with valid external lock ?

  The SAP error message /SCWM/BIF_TAPP000 Access to TU assignment &1 only possible with valid external lock typically occurs in the context of the SAP Extended Warehouse Management (EWM) module. This error indicates that there is an attempt to access a Transport Unit (TU) assignment that is currently locked by another process or user. The locking mechanism is in place to prevent data inconsistencies that could arise from concurrent modifications.
  
  Cause:
  
  Concurrent Access: Another user or process is currently accessing or modifying the TU assignment, which leads to a lock being placed on it.
  Session Timeout: If a session that had a lock on the TU assignment times out or is terminated unexpectedly, the lock may not be released properly.
  System Configuration: There may be issues with the configuration of the locking mechanism in the SAP system.
  
  
  Solution:
  
  Check Locks: Use transaction code SM12 to check for existing locks on the TU assignment. If you find a