How To Fix SDDL_PARSER_MSG126 - Union: Association & is different in the selections

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 126

• Message text: Union: Association & is different in the selections

What causes this issue?

If associations are to be exposed in a CDS view with UNION or UNION ALL,
the respective associations must have identical characteristics in all
selection lists.
This means that the following characteristics of assocations must be
identical:
Names or alias names
Specifications relating to cardinality
Association Targets
ON conditions
Position in the Selection List
In this assoziation &V1&, a difference was found in the item &V2&.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

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 SDDL_PARSER_MSG126 - Union: Association & is different in the selections ?

  The SAP error message SDDL_PARSER_MSG126 typically occurs in the context of SAP's Business Suite, particularly when dealing with data selection in queries or reports. This error indicates that there is a mismatch in the associations defined in the selection criteria of a query or report.
  Cause:
  The error message SDDL_PARSER_MSG126 arises when:
  
  There are multiple associations defined in the selection criteria, and they are not consistent with each other.
  The fields or entities being selected are not properly aligned with the associations defined in the data model.
  The query is trying to access data from different entities that are not correctly linked through the defined associations.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Selection Criteria:
  
  Check the selection criteria in your query or report. Ensure that the associations used are consistent and correctly defined.
  Make sure that the fields you are selecting are compatible with the associations.
  
  
  
  Check Data Model:
  
  Review the underlying data model to ensure that the associations are correctly defined. This includes checking the relationships between the entities involved in the selection.
  
  
  
  Modify the Query:
  
  If you are using a custom query, consider modifying it to ensure that the associations are correctly aligned. You may need to remove or adjust certain fields in the selection criteria.
  
  
  
  Test with Simplified Criteria:
  
  Try running the query with simplified selection criteria to isolate the issue. Gradually add back the fields to identify which specific association is causing the error.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for guidance on how to properly define associations and selection criteria in your specific context.
  
  
  
  Seek Help from SAP Support:
  
  If the issue persists, consider reaching out to SAP support for assistance. They can provide more detailed insights based on your specific system configuration and data model.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  Training Resources: Consider training or resources on SAP query design and data modeling to better understand how to manage associations and selections.
  
  By following these steps, you should be able to identify and resolve the cause of the SDDL_PARSER_MSG126 error in your SAP environment.