How To Fix WER278 - Parameter &1 is not assignable

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 278

• Message text: Parameter &1 is not assignable

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WER278 - Parameter &1 is not assignable ?

  Certainly! Here's a detailed explanation for the SAP error message WER278: Parameter &1 is not assignable:
  
  Error Message
  WER278: Parameter &1 is not assignable
  
  Cause
  This error occurs when there is an attempt to assign a value to a parameter that is defined as importing or changing in a function module or method, but the parameter is either:
  
  Not declared as assignable (e.g., it is an importing parameter which is not allowed to be changed inside the function module),
  Or the parameter is passed by value and not by reference,
  Or the parameter is read-only in the current context.
  
  In ABAP, parameters in function modules or methods can be defined as:
  
  IMPORTING (input only, not assignable),
  EXPORTING (output only),
  CHANGING (input/output, assignable),
  TABLES (special type, assignable).
  
  If you try to assign a value to an IMPORTING parameter or a parameter that is not declared as CHANGING or TABLES, the system raises this error.
  
  Typical Scenario
  
  You have a function module or method with an IMPORTING parameter.
  Inside the function module or method, you try to assign a value to this parameter.
  Since IMPORTING parameters are passed by value and are not assignable, the system throws WER278.
  
  
  Solution
  
  Check the parameter definition in the function module or method interface.
  If you need to modify the parameter inside the function module or method, change the parameter type from IMPORTING to CHANGING.
  Alternatively, if the parameter should only be input, do not assign a value to it inside the function module or method.
  If you only need to return a value, use an EXPORTING or CHANGING parameter.
  Review the code and remove any assignment statements to parameters that are not assignable.
  
  
  Example
  Incorrect:
  FUNCTION z_test.
    IMPORTING
      VALUE(iv_param) TYPE i.
    iv_param = iv_param + 1. " This causes WER278
  ENDFUNCTION.
  Correct:
  FUNCTION z_test.
    CHANGING
      VALUE(cv_param) TYPE i.
    cv_param = cv_param + 1. " Allowed because cv_param is CHANGING
  ENDFUNCTION.
  
  Related Information
  
  SAP Note: Sometimes SAP Notes related to specific function modules or standard code might mention this error.
  ABAP documentation on Function Module Parameters and Method Parameters.
  SAP Help Portal: Function Modules
  ABAP Keyword Documentation on IMPORTING, EXPORTING, CHANGING parameters.
  
  
  If you provide the exact code snippet or context where the error occurs, I can help you with a more precise solution.