How To Fix SDDL_PARSER_MSG251 - Field &1 already used in the ON condition of the composition definition

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 251

• Message text: Field &1 already used in the ON condition of the composition definition

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG251 - Field &1 already used in the ON condition of the composition definition ?

  The SAP error message SDDL_PARSER_MSG251 indicates that there is a problem with the definition of a composition in the SAP system, specifically related to the use of fields in the ON condition of the composition definition. This error occurs when a field is being used more than once in the ON condition, which is not allowed.
  Cause:
  The error is caused by the following:
  
  A field (denoted as &1 in the error message) is included multiple times in the ON condition of a composition definition. This can happen if the same field is mistakenly referenced more than once, or if there is a misunderstanding of how to structure the ON condition.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Composition Definition:
  
  Go to the relevant transaction or area in SAP where the composition definition is maintained.
  Check the ON condition of the composition definition for duplicate field references.
  
  
  
  Remove Duplicate Fields:
  
  If you find that the same field is listed more than once, remove the duplicates so that each field is only referenced once in the ON condition.
  
  
  
  Validate the Logic:
  
  Ensure that the logic of the ON condition is still valid after removing duplicates. The ON condition should correctly reflect the relationships you want to establish.
  
  
  
  Test the Changes:
  
  After making the necessary adjustments, save the changes and test the composition definition to ensure that the error no longer occurs.
  
  
  
  Documentation:
  
  Document the changes made for future reference and to help others who may encounter similar issues.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on composition definitions and ON conditions.
  SAP Community: You can search for discussions or similar issues in the SAP Community forums, where other users may have shared their experiences and solutions.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  
  By following these steps, you should be able to resolve the SDDL_PARSER_MSG251 error and successfully define your composition without issues.