How To Fix GL420 - The sequence may overwrite values of other sequences

SAP Error Message - Details

• Message type: E = Error

• Message class: GL - FI-SL Rollup

• Message number: 420

• Message text: The sequence may overwrite values of other sequences

What causes this issue?

For each field movement defined in the rollup, a separate internal table
is generated in which the data is summarized and stored. If you use
several rollup sequences in a rollup with different field movements, it
is quite possible that a sequence will overwrite the values of a
sequence that has already been processed.

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?

Please check whether the above situation can occur. If the quantities
created by the different sequences are out of sync, you can execute the
rollup. If a sequence could be overwritten, you should divide this
'critical' rollup into several individual rollups.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GL420 - The sequence may overwrite values of other sequences ?

  The SAP error message GL420, which states "The sequence may overwrite values of other sequences," typically occurs in the context of General Ledger (GL) accounting when there is an issue with the sequence numbers assigned to documents or postings. This error indicates that the system has detected a potential conflict where the sequence number being used could overwrite existing values from other sequences, leading to data integrity issues.
  Causes:
  
  Duplicate Sequence Numbers: The error often arises when there are duplicate sequence numbers in the same fiscal year or period, which can happen if the configuration for number ranges is not set up correctly.
  Incorrect Number Range Configuration: If the number range intervals for document types are overlapping or not properly defined, it can lead to conflicts.
  Posting in the Wrong Period: Attempting to post documents in a closed period or fiscal year can also trigger this error.
  Custom Development: If there are custom programs or enhancements that manipulate document numbers or sequences, they may inadvertently cause conflicts.
  
  Solutions:
  
  
  Check Number Range Configuration:
  
  Go to the transaction code SNRO (Number Range Objects) and check the configuration for the relevant number range object (e.g., for accounting documents).
  Ensure that the number ranges are correctly defined and do not overlap.
  
  
  
  Review Document Types:
  
  Use transaction code OBY6 to review the document types and their associated number ranges. Make sure that each document type has a unique number range that does not conflict with others.
  
  
  
  Adjust Posting Periods:
  
  Ensure that you are posting in an open period. You can check the posting periods using transaction code OB52 and adjust them if necessary.
  
  
  
  Check for Custom Code:
  
  If there are any custom developments or enhancements, review the code to ensure that it is not causing the issue. You may need to consult with your ABAP developer.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  
  Testing:
  
  After making changes, perform test postings to ensure that the issue is resolved and that no further conflicts arise.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  SNRO: Number Range Objects
  OBY6: Document Type Configuration
  OB52: Open and Close Posting Periods
  
  
  SAP Documentation: Refer to SAP Help documentation for detailed information on number range management and GL accounting.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the root cause of the GL420 error and implement a solution to resolve it.