How To Fix WER156 - Parameter &1 must be of type element, structure or table

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 156

• Message text: Parameter &1 must be of type element, structure or table

Self-Explanatory Message

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• What is the cause and solution for SAP error message WER156 - Parameter &1 must be of type element, structure or table ?

  Certainly! Here's a detailed explanation for the SAP error message WER156: Parameter &1 must be of type element, structure or table:
  
  Error Message
  WER156: Parameter &1 must be of type element, structure or table
  
  Cause
  This error occurs when a parameter in a function module, method, or form routine is expected to be a data object of type element, structure, or table, but the actual parameter passed or declared is of an incompatible type.
  In SAP ABAP, parameters that are passed to function modules or methods must be of certain data types. The system expects the parameter to be a single data element (element), a structured data type (structure), or an internal table (table). If the parameter is declared as a reference type, a field symbol, or some other incompatible type, this error will be raised.
  Common scenarios causing this error:
  
  Passing a reference variable instead of a data object.
  Declaring a parameter as a field symbol or data reference.
  Using incompatible data types in the interface of a function module or method.
  
  
  Solution
  
  
  Check the parameter declaration:
  
  Ensure that the parameter is declared as a data element, structure, or internal table.
  Avoid using field symbols (<fs>) or data references (REF TO ...) as parameters where this error occurs.
  
  
  
  Adjust the parameter type:
  
  If you are passing a reference, dereference it before passing.
  Change the parameter type in the interface to a compatible type.
  
  
  
  Example:
  
  Incorrect:
  FUNCTION my_function.
    IMPORTING
      VALUE(param) TYPE REF TO data.
  ENDFUNCTION.
  
  Correct:
  FUNCTION my_function.
    IMPORTING
      VALUE(param) TYPE some_structure.
  ENDFUNCTION.
  
  
  
  
  If you need to pass a reference:
  
  Pass the dereferenced object or change the interface to accept a reference explicitly if supported.
  
  
  
  Check the calling program:
  
  Make sure the actual parameter passed matches the expected type.
  
  
  
  
  Related Information
  
  SAP Note: Sometimes SAP Notes related to specific function modules or methods may provide additional guidance.
  ABAP Documentation: Review the ABAP documentation on parameter passing and data types.
  Debugging: Use the debugger to check the actual type of the parameter at runtime.
  Function Module Interface: Use transaction SE37 to check the interface of the function module.
  Class Method Interface: Use transaction SE24 to check method parameters.
  
  
  Summary
  
  Cause: Parameter passed or declared is not an element, structure, or table.
  Solution: Change the parameter type to a compatible data type (element, structure, or table).
  Check: Parameter declarations, calling code, and interface definitions.
  
  
  If you provide the specific code snippet or context where this error occurs, I can help you with a more precise solution.