How To Fix CP129 - Key date & will be overwritten by date in change number.

CP129 - Overview

• Message type: E = Error

• Message class: CP - Task list messages: Core data

• Message number: 129

• Message text: Key date & will be overwritten by date in change number.

What causes this issue?

You are attempting to create, change or display a rate routing or a
reference rate routing with a change number.
The default value for the key date is today's date. This default will
be overwritten by the date in the change number when you enter a change
number.

System Response

When you create rate routings or reference rate routings, the system
writes new data records with this date.
When you change rate routings or reference rate routings with history,
the changes are valid as of this date.
Only rate routings and reference rate routings that are valid as of
this key date are selected.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CP129 - Key date & will be overwritten by date in change number. ?

  The SAP error message CP129 indicates that there is a conflict between the key date you are trying to use in a change number and the date that is already set in the change number. This typically occurs in the context of change management in SAP, particularly when dealing with production planning and control (PP) or project systems (PS).
  
  Cause:
  The error occurs when:
  
  You are trying to assign a key date to a change number that is already associated with a different date.
  The key date you are trying to use is not compatible with the existing data in the change number.
  There may be a mismatch in the dates due to changes made in the system or incorrect data entry.
  
  
  Solution:
  To resolve the CP129 error, you can take the following steps:
  
  
  Check the Change Number: Review the change number you are working with to see what key date is currently assigned. You can do this