How To Fix WER157 - Type &1 of parameter &2 is must be a DDIC data element

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 157

• Message text: Type &1 of parameter &2 is must be a DDIC data element

Self-Explanatory Message

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• What is the cause and solution for SAP error message WER157 - Type &1 of parameter &2 is must be a DDIC data element ?

  The SAP error message:
  WER157 Type &1 of parameter &2 is must be a DDIC data element
  typically occurs during the development or modification of ABAP function modules, methods, or interfaces when defining parameters.
  
  Cause
  
  The error indicates that the type assigned to a parameter (importing, exporting, changing, or tables parameter) is not a valid Data Dictionary (DDIC) data element.
  In SAP, certain parameters (especially in function modules and interfaces) require their types to be defined as DDIC data elements rather than just local or elementary types.
  This is because DDIC data elements ensure consistency, reusability, and integration with the SAP data dictionary, enabling better type checking and documentation.
  
  
  When does it occur?
  
  When you try to assign a parameter type using a local type (defined in the program or class) or a non-DDIC type.
  When the parameter type is a structure or table type that is not defined in the Data Dictionary.
  When creating or changing function module parameters or interface method parameters that require DDIC types.
  
  
  Solution
  
  
  Use a DDIC Data Element as the Parameter Type:
  
  Instead of using a local type or a direct elementary type (like I, C, N), use a data element defined in the ABAP Dictionary.
  For example, if you want an integer parameter, use a data element like SYST-INDEX or create a custom data element in SE11 and use it.
  
  
  
  Create a Data Element if Needed:
  
  If no suitable data element exists, create one in transaction SE11:
  
  Go to SE11 ? Data Element ? Create.
  Define the data element with the required domain and attributes.
  Activate it.
  
  
  Then use this data element as the parameter type.
  
  
  
  Check Parameter Type in Function Module or Interface:
  
  Go to the function module or interface method.
  Change the parameter type to the DDIC data element.
  Save and activate.
  
  
  
  For Structures or Table Types:
  
  Use DDIC structures or table types defined in SE11.
  Avoid using local types or inline declarations for parameters that require DDIC types.
  
  
  
  
  Additional Information
  
  This requirement is stricter for Remote Function Calls (RFCs) and BAPIs, where parameters must be DDIC types to ensure compatibility and transportability.
  Using DDIC data elements helps maintain consistency across different programs and modules.
  The error message is part of the SAP standard message class WER (Workflow Error Messages), but it applies generally to parameter type definitions.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WER157 Type &1 of parameter &2 is must be a DDIC data element
  
  
  Cause
  Parameter type is not a DDIC data element (local or non-DDIC type used)
  
  
  Solution
  Use a DDIC data element as the parameter type; create one if necessary in SE11
  
  
  Context
  Function modules, interface methods, RFCs, BAPIs
  
  
  Tools
  SE11 (Data Element creation), SE37 (Function Module), SE24 (Class Builder)
  
  
  
  
  If you provide the exact context (e.g., function module, interface method, or class method), I can give more tailored advice.