How To Fix PPER3E_ECN020 - The change number sequence (&1 <-> &2) is not unique

PPER3E_ECN020 - Overview

• Message type: E = Error

• Message class: PPER3E_ECN - Message Class for BAdI Class CL_PPER3E_ECN

• Message number: 020

• Message text: The change number sequence (&1 <-> &2) is not unique

What causes this issue?

At least one change number lies on the cycle. This makes unique
sequencing impossible (change number &v1& <-> change number &v2&, node
&v3&, variant &v4&).

System Response

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?

Remove the cycle.
To do so, choose Logistic -> Production -> Master Data -> Integrated
Product Engineering -> <DS:TRAN.CCSEQ_CYCLE>Display Cycles</>.

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 PPER3E_ECN020 - The change number sequence (&1 <-> &2) is not unique ?

  The SAP error message PPER3E_ECN020 indicates that there is a problem with the uniqueness of change numbers in the system. This error typically arises when you are trying to create or modify a change number (or change document) in the Engineering Change Management (ECM) module, and the system detects that the change number sequence you are trying to use is not unique.
  
  Cause:
  
  
  Duplicate Change Numbers: The error occurs when there are two or more change numbers that are conflicting or overlapping in the system. This can happen if:
  
  Change numbers are being created or modified simultaneously by different users.
  There is a configuration issue in the change number range settings.
  The change number sequence has not been properly defined or has been corrupted.
  
  
  
  Incorrect Configuration: The configuration settings for change number ranges may not be set up correctly, leading to overlaps.
  
  
  
  Solution:
  
  
  Check for Duplicates: 
  
  Go to the change number management transaction (e.g., transaction code CC01 for