How To Fix /IWFND/CM_DESIGNTIME015 - Internal data type not supported: '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_DESIGNTIME -

• Message number: 015

• Message text: Internal data type not supported: '&1'

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/CM_DESIGNTIME015 - Internal data type not supported: '&1' ?

  The SAP error message /IWFND/CM_DESIGNTIME015 Internal data type not supported: '&1' typically occurs in the context of SAP Gateway and OData services. This error indicates that there is an issue with the data type being used in the OData service definition, specifically that the internal data type is not recognized or supported by the system.
  Cause:
  
  Unsupported Data Type: The error is often caused by using a data type in the data model that is not supported by the OData service. This can happen if the data type is custom or not recognized by the OData framework.
  Model Definition Issues: There may be issues in the way the data model is defined in the service, such as incorrect mappings or unsupported field types.
  Inconsistent Metadata: If the metadata of the OData service is inconsistent or not properly generated, it can lead to this error.
  Version Compatibility: The error may also arise if there are compatibility issues between the SAP system version and the data types being used.
  
  Solution:
  
  Check Data Types: Review the data types used in your data model. Ensure that all data types are supported by the OData service. Common supported types include Edm.String, Edm.Int32, Edm.Boolean, etc.
  Adjust Model Definitions: If you find unsupported data types, consider changing them to supported types. This may involve modifying the underlying ABAP structures or data elements.
  Regenerate Metadata: If you have made changes to the data model, regenerate the metadata for the OData service. You can do this by using transaction /IWFND/MAINT_SERVICE to maintain the service and regenerate the metadata.
  Check Service Implementation: Ensure that the service implementation (e.g., the DPC and MPC classes) correctly handles the data types and that there are no discrepancies.
  Debugging: If the issue persists, consider debugging the OData service to trace where the unsupported data type is being referenced.
  Consult Documentation: Refer to SAP documentation for the specific version you are using to ensure that you are aware of any limitations or changes in supported data types.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found.
  OData Documentation: Review the official OData documentation for SAP to understand the supported data types and best practices for defining OData services.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.