How To Fix /IWFND/MED_CHECK044 - Core type value '&2' in '&1' not valid

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/MED_CHECK -

• Message number: 044

• Message text: Core type value '&2' in '&1' not valid

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/MED_CHECK044 - Core type value '&2' in '&1' not valid ?

  The SAP error message /IWFND/MED_CHECK044 indicates that there is an issue with the core type value in an OData service. Specifically, the message states that the core type value &2 in &1 is not valid. This error typically arises when the OData service is trying to process a request that includes an invalid or unsupported data type.
  Cause:
  
  Invalid Data Type: The core type specified in the OData service metadata is not recognized or is incorrectly defined.
  Mismatch in Data Model: There may be a mismatch between the data model defined in the backend and what is expected by the OData service.
  Incorrect Annotations: The annotations in the service definition may not align with the actual data types being used.
  Service Configuration Issues: The OData service may not be properly configured to handle the specified core type.
  
  Solution:
  
  Check Metadata: Review the OData service metadata (usually accessible via the service URL with $metadata appended) to ensure that the core type is correctly defined.
  Validate Data Types: Ensure that the data types used in your entity types and properties match the expected core types. Common core types include Edm.String, Edm.Int32, etc.
  Update Annotations: If you are using annotations, verify that they are correctly defined and correspond to the actual data types in your backend.
  Regenerate Service: If changes were made to the data model or annotations, regenerate the OData service to ensure that the changes are reflected.
  Check Service Implementation: If you have custom logic in your OData service implementation, ensure that it correctly handles the data types being passed.
  Debugging: Use transaction codes like /IWFND/ERROR_LOG to check for additional error details that may provide more context on the issue.
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP can help in troubleshooting issues related to data types and service definitions.
  SAP Gateway: Familiarize yourself with SAP Gateway concepts, as it plays a crucial role in exposing OData services.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific error message or OData service you are working with.
  Community Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the issue causing the /IWFND/MED_CHECK044 error in your SAP OData service.