How To Fix AJ126 - Season definition for season &1 is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: AJ - Billing program

• Message number: 126

• Message text: Season definition for season &1 is not unique

What causes this issue?

You have defined season &v1& in the rate category facts or installation
facts. In doing so, you have defined the season periods differently for
the season, and this is not permitted.

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?

Define one season period for season &v1&. Check the season definitions
in the rate category facts for rate categories &v2& and &v3& and in the
installation facts for installation &v3&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AJ126 - Season definition for season &1 is not unique ?

  The SAP error message AJ126, which states "Season definition for season &1 is not unique," typically occurs in the context of SAP's Seasonal Planning or similar modules where seasons are defined for various planning purposes. This error indicates that there are multiple entries in the system for the same season, which leads to ambiguity in the data.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that there are duplicate season definitions in the system. This can happen if the same season is defined multiple times with the same identifier or if there are overlapping date ranges for the same season.
  Incorrect Configuration: There may be a configuration issue where the season definitions are not set up correctly, leading to conflicts.
  Data Migration Issues: If data has been migrated from another system, it is possible that duplicate records were created during the migration process.
  
  Solution:
  
  Check Season Definitions: Go to the transaction code related to season definitions (e.g., AJ01 for creating seasons or AJ02 for changing them) and review the existing entries. Look for duplicates or overlapping definitions for the same season.
  Delete or Modify Duplicates: If you find duplicate entries, you can either delete the unnecessary ones or modify them to ensure that each season has a unique definition.
  Review Configuration: Ensure that the configuration settings for seasons are correct and that there are no conflicting settings that could lead to this error.
  Data Consistency Check: If the issue arose after a data migration, perform a consistency check to identify and resolve any duplicate records that may have been created during the migration process.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as AJ01, AJ02, and AJ03 for managing season definitions.
  Documentation: Refer to SAP documentation or help files for detailed information on how to manage seasons and the implications of duplicate entries.
  Support: If the issue persists after checking for duplicates and correcting them, consider reaching out to SAP support or consulting with a functional consultant who specializes in the relevant module.
  
  By following these steps, you should be able to resolve the AJ126 error and ensure that your season definitions are unique and correctly configured.