How To Fix SDDL_PARSER_MSG421 - Path expression not allowed in projection view

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 421

• Message text: Path expression not allowed in projection view

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG421 - Path expression not allowed in projection view ?

  The SAP error message SDDL_PARSER_MSG421 with the description "Path expression not allowed in projection view" typically occurs in the context of SAP Gateway or OData services when there is an issue with the way a projection view is defined or used in an OData service.
  Cause:
  This error usually arises due to the following reasons:
  
  
  Invalid Path Expression: The projection view is trying to use a path expression that is not allowed. In OData services, path expressions are used to navigate through the data model, but certain views or projections may not support them.
  
  
  Incorrect View Definition: The projection view may be incorrectly defined, leading to the inability to process path expressions. This can happen if the view is not set up to expose the necessary fields or relationships.
  
  
  OData Service Configuration: The OData service may not be configured correctly to handle the projection view, leading to issues when trying to access data through the service.
  
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Review the Projection View: Check the definition of the projection view in the SAP system. Ensure that it is correctly defined and does not include unsupported path expressions.
  
  
  Modify the OData Service: If the OData service is using the projection view, ensure that the service is configured to handle the data model correctly. You may need to adjust the service definition to avoid using path expressions that are not allowed.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as there may be fixes related to OData services and projection views.
  
  
  Consult Documentation: Refer to the SAP documentation for OData services and projection views to understand the limitations and requirements for using path expressions.
  
  
  Testing: After making changes, test the OData service again to see if the error persists. Use tools like SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test the service.
  
  
  Seek Help from SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance. They may provide insights specific to your system configuration.
  
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP can help in troubleshooting issues related to data access and manipulation.
  Projection Views: Familiarize yourself with how projection views are defined and used in SAP, including their limitations regarding path expressions.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on best practices for using projection views in OData services.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.