How To Fix SDDIC_ADT_DDLX026 - 'keyElementRef' type for annotation '&1' is not supported

SDDIC_ADT_DDLX026 - Overview

• Message type: E = Error

• Message class: SDDIC_ADT_DDLX - Messages for CDS Metadata Extension

• Message number: 026

• Message text: 'keyElementRef' type for annotation '&1' is not supported

Self-Explanatory Message

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SDDIC_ADT_DDLX026 - Details

• The SAP error message SDDIC_ADT_DDLX026 with the description 'keyElementRef' type for annotation '&1' is not supported typically occurs in the context of using the ABAP Development Tools (ADT) or when working with annotations in the context of CDS (Core Data Services) views or other data modeling scenarios.
  
  Cause:
  This error generally indicates that there is an issue with the way annotations are defined in your CDS view or data model. Specifically, it suggests that the type of the keyElementRef annotation being used is not supported or recognized by the system. This can happen due to:
  
  Incorrect Annotation Usage: The annotation might be incorrectly defined or used in a context where it is not applicable.
  Version Compatibility: The version of the SAP system or the tools you are using may not support the specific annotation or its usage.
  Syntax Errors: There may be syntax errors in the CDS view or the way the annotations are structured.
  
  
  Solution:
  To