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

SAP Error Message - Details

• 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 creating change numbers) and check if the change numbers you are trying to use already exist in the system.
  Use transaction SE16 or SE11 to query the relevant database tables (like ECN or ECN_HEADER) to find any existing change numbers that might be causing the conflict.
  
  
  
  Adjust Change Number Ranges:
  
  If you find that the change number ranges are overlapping, you may need to adjust the configuration. This can be done in the customizing settings (transaction SPRO):
  
  Navigate to Logistics -> Engineering Change Management -> Change Number -> Define Change Number Ranges.
  Ensure that the ranges are set up correctly and do not overlap.
  
  
  
  
  
  Locking Issues:
  
  If multiple users are trying to create or modify change numbers at the same time, consider implementing a locking mechanism or coordinating the changes to avoid conflicts.
  
  
  
  Consult Documentation: 
  
  Review SAP documentation or notes related to Engineering Change Management for any specific guidelines or known issues related to change number management.
  
  
  
  Contact SAP Support: 
  
  If the issue persists after checking for duplicates and adjusting configurations, consider reaching out to SAP support for further assistance. They may provide patches or additional insights based on the specific version of SAP you are using.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CC01 (Create Change Number), CC02 (Change Change Number), and CC03 (Display Change Number).
  Tables: Understand the relevant tables involved in change number management, such as ECN (Change Number) and ECN_HEADER.
  User Authorizations: Ensure that users have the necessary authorizations to create or modify change numbers, as insufficient permissions can also lead to errors.
  
  By following these steps, you should be able to resolve the PPER3E_ECN020 error and ensure that your change number sequences are unique and properly configured.