How To Fix SDDL_PARSER_MSG152 - The annotation value NULL is only allowed within the selection list.

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 152

• Message text: The annotation value NULL is only allowed within the selection list.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG152 - The annotation value NULL is only allowed within the selection list. ?

  The SAP error message SDDL_PARSER_MSG152 indicates that there is an issue with the use of the annotation value NULL in a context where it is not allowed. This error typically arises in the context of SAP's OData services or when working with the SAP Gateway, particularly when defining or consuming annotations in your data model.
  Cause:
  The error occurs when the annotation value NULL is used outside of the selection list. In OData services, annotations are used to provide metadata about the data being exposed. The NULL value is only permissible in specific contexts, such as within a selection list where it indicates that a particular field can be null. If it is used incorrectly, the parser will throw this error.
  Solution:
  To resolve this error, you should:
  
  
  Review the Annotation Definition: Check the definition of the annotations in your OData service or data model. Ensure that NULL is only used in the appropriate context, such as within a selection list.
  
  
  Correct the Usage: If you find that NULL is being used incorrectly, modify the annotation to either remove the NULL value or place it in the correct context.
  
  
  Validate the OData Service: After making changes, validate your OData service to ensure that it is functioning correctly and that the error no longer appears.
  
  
  Check Documentation: Refer to the SAP documentation for OData and annotations to understand the correct usage of NULL and other annotation values.
  
  
  Testing: After making the necessary changes, test the OData service to confirm that the error has been resolved and that the service behaves as expected.
  
  
  Related Information:
  
  SAP OData Services: Understanding how OData services work in SAP can help you better manage annotations and avoid similar errors in the future.
  SAP Gateway: Familiarize yourself with the SAP Gateway framework, as it is often involved in the creation and consumption of OData services.
  Debugging Tools: Use SAP's debugging tools to trace the execution of your OData service and identify where the error is occurring.
  
  If the problem persists after following these steps, consider reaching out to SAP support or consulting with a developer who has experience with SAP OData services for further assistance.