How To Fix SDDL_PARSER_MSG298 - Key &1 already used in ON condition in to-parent association

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 298

• Message text: Key &1 already used in ON condition in to-parent association

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG298 - Key &1 already used in ON condition in to-parent association ?

  The SAP error message SDDL_PARSER_MSG298 indicates that there is a problem with the definition of an association in your data model, specifically in the context of the SAP Business Application Studio or SAP Cloud Application Programming Model (CAP). The error message states that a key (identified by &1) is already being used in an "ON" condition in a "to-parent" association.
  Cause:
  This error typically occurs when:
  
  You have defined an association in your data model where the same key is being used multiple times in the "ON" condition for a "to-parent" association.
  The association is trying to link two entities, but the key used to establish the relationship is not unique or is incorrectly defined.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Association Definition:
  
  Check the definition of the associations in your data model. Ensure that each association uses unique keys and that there are no duplicate keys in the "ON" conditions.
  
  
  
  Modify the Keys:
  
  If you find that the same key is being used in multiple associations, consider modifying the keys to ensure that each association has a unique key.
  
  
  
  Check Parent-Child Relationships:
  
  Ensure that the parent-child relationships are correctly defined. The parent entity should have a unique key that is referenced correctly in the child entity.
  
  
  
  Validate the Data Model:
  
  Use the validation tools available in your development environment to check for any inconsistencies or errors in your data model.
  
  
  
  Consult Documentation:
  
  Refer to the official SAP documentation for guidance on defining associations and keys in your specific context (e.g., CDS views, OData services).
  
  
  
  Related Information:
  
  SAP Documentation: Look for the SAP Help Portal or the specific documentation related to the SAP Business Application Studio or CAP for detailed guidelines on defining associations and keys.
  Community Forums: Check SAP Community forums or Stack Overflow for similar issues and solutions shared by other developers.
  Debugging Tools: Utilize debugging tools within your development environment to trace the error and understand the context in which it occurs.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.