How To Fix SWF_FLEX_CDS023 - Unsupported data type '&1' as key.

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_FLEX_CDS - CDS Message Class

• Message number: 023

• Message text: Unsupported data type '&1' as key.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWF_FLEX_CDS023 - Unsupported data type '&1' as key. ?

  The SAP error message SWF_FLEX_CDS023 indicates that there is an unsupported data type being used as a key in a Core Data Services (CDS) view or in a related context. This typically occurs when the data type of a field that is expected to be a key does not conform to the requirements set by the CDS framework.
  Cause:
  
  Unsupported Data Type: The error is triggered when a field defined as a key in a CDS view is of a data type that is not supported for key fields. Common unsupported types include complex types, certain character types, or any non-scalar types.
  Incorrect Definition: The key field may be incorrectly defined in the CDS view or the underlying database table.
  Incompatibility with Framework: The data type may not be compatible with the expected key types in the context of the application or service using the CDS view.
  
  Solution:
  
  
  Check Data Types: Review the data types of the fields defined as keys in your CDS view. Ensure that they are of a supported type, such as:
  
  Integer types (e.g., I, INT)
  Character types (e.g., C, D, N)
  Date types (e.g., D)
  String types (e.g., STRING)
  
  
  
  Modify the CDS View: If you find that a key field is using an unsupported data type, modify the CDS view to use a supported data type. This may involve changing the data type in the underlying table or creating a new field with a compatible type.
  
  
  Check Annotations: Ensure that any annotations related to the key fields are correctly defined. Sometimes, annotations can affect how the data types are interpreted.
  
  
  Test Changes: After making changes, activate the CDS view and test it to ensure that the error is resolved.
  
  
  Consult Documentation: Refer to the SAP documentation for Core Data Services to understand the supported data types for key fields and any specific requirements for your version of SAP.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context.
  CDS View Documentation: Review the official SAP documentation on CDS views for best practices and guidelines on defining keys and data types.
  Community Forums: Engage with the SAP community forums or SAP Help Portal for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the SWF_FLEX_CDS023 error and implement a solution to resolve it.