How To Fix CC409 - Numeric change numbers already exist in the system

CC409 - Overview

• Message type: E = Error

• Message class: CC - ECM: Messages

• Message number: 409

• Message text: Numeric change numbers already exist in the system

What causes this issue?

Numeric change numbers exist in the system. If you activate
lexicographical storage of change numbers, these change numbers will no
longer be capable of being interpreted.
By setting the "Lexicographical" indicator, you change the way in which
numeric change numbers are stored. Numeric change numbers are then
stored in tables as left justified, not as right justified.

How can this happen?

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

Length of change number:,,8
Entry:,,12345
Old storage:,,000000012345
New storage:,, 00012345____

System Response

How to fix this error?

You cannot change the storage form for change numbers if there are
already numeric change numbers in the system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CC409 - Numeric change numbers already exist in the system ?

  The SAP error message CC409 ("Numeric change numbers already exist in the system") typically occurs in the context of Change Management within SAP, particularly when dealing with change numbers in the SAP Project System (PS) or Production Planning (PP) modules. This error indicates that there is an attempt to create or use a change number that already exists in the system, which can lead to conflicts or inconsistencies.
  
  Cause:
  
  Duplicate Change Numbers: The most common cause of this error is that the change number you are trying to create or use is already present in the system. Change numbers are unique identifiers, and SAP does not allow duplicates.
  Incorrect Configuration: There may be issues with the configuration settings for change management, leading to the system not recognizing the uniqueness of the change number.
  Data Migration Issues: If data has been migrated from another system or if there have been manual entries, it is possible