How To Fix CM104 - Change number collision on the BOM header

CM104 - Overview

• Message type: E = Error

• Message class: CM - Task list messages: Material component allocations

• Message number: 104

• Message text: Change number collision on the BOM header

What causes this issue?

You are attempting to change a task list or a standard network with a
change number and you also want to change the bill of material assigned
to it. However, the bill of material header was already changed with a
different change number which has the same valid-from date as the
change number from your task list.
Therefore, you cannot change the bill of material header.

How to fix this error?

Change your task list or standard network with a different change
number. Note the valid-from date of the change number.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM104 - Change number collision on the BOM header ?

  The SAP error message CM104, which states "Change number collision on the BOM header," typically occurs when there are concurrent changes being made to a Bill of Materials (BOM) in SAP. This situation arises when two or more users attempt to modify the same BOM header with different change numbers at the same time, leading to a conflict.
  
  Cause:
  
  Concurrent Modifications: Multiple users are trying to change the BOM header simultaneously, each using different change numbers.
  Change Number Management: The system uses change numbers to track modifications. If two changes are attempted at the same time, the system cannot determine which change should take precedence.
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If a BOM is locked by one user, another user trying to make changes will encounter this error.
  
  
  Solution:
  
  Check for Locks: Use transaction code SM12 to check for any existing locks on the BOM. If a lock exists, you