How To Fix WER158 - Method could not be called dynamically

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 158

• Message text: Method could not be called dynamically

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WER158 - Method could not be called dynamically ?

  The SAP error message WER158: Method could not be called dynamically typically occurs in ABAP Object-Oriented programming when there is an attempt to call a method dynamically (using CALL METHOD or CALL METHOD OF with a method name determined at runtime), but the method call fails.
  
  Cause
  
  Method name is incorrect or does not exist: The method name passed dynamically is either misspelled, does not exist in the class, or is not visible (e.g., private or protected).
  Object reference is invalid: The object reference on which the method is called is INITIAL or not properly instantiated.
  Method signature mismatch: The parameters passed dynamically do not match the method's signature.
  Method is not accessible: The method might be static, but called as an instance method or vice versa.
  Dynamic call syntax error: The syntax used for dynamic method call is incorrect.
  
  
  Solution
  
  
  Check the method name:
  
  Verify that the method name string used in the dynamic call exactly matches the method name defined in the class (case-sensitive).
  Use cl_abap_typedescr or cl_abap_classdescr to check if the method exists dynamically.
  
  
  
  Ensure the object reference is valid:
  
  Make sure the object reference is instantiated before the dynamic call.
  Check for IS BOUND before calling the method dynamically.
  
  
  
  Check method visibility and signature:
  
  Confirm the method is PUBLIC or accessible in the current context.
  Verify the parameters passed match the method's signature.
  
  
  
  Use correct syntax for dynamic calls:
  
  Example of dynamic method call:
  CALL METHOD object_ref (method_name) EXPORTING ... IMPORTING ...
  
  Or using CALL METHOD OF:
  CALL METHOD OF object_ref method_name EXPORTING ... IMPORTING ...
  
  
  
  
  Debugging:
  
  Set a breakpoint before the dynamic call.
  Inspect the method name and object reference.
  Use cl_abap_classdescr=>describe_by_object to get class info and check method existence.
  
  
  
  
  Related Information
  
  SAP Note: Check SAP Notes related to WER158 for specific patches or known issues.
  ABAP Documentation: Refer to ABAP documentation on dynamic method calls.
  Class and Method Introspection: Use runtime type services (RTTS) classes like cl_abap_classdescr to inspect classes and methods dynamically.
  Error Handling: Implement error handling around dynamic calls to catch exceptions like CX_SY_DYNAMIC_CALL_ILLEGAL_METHOD.
  
  
  Example
  DATA: obj TYPE REF TO zcl_my_class,
        method_name TYPE string.
  
  obj = NEW zcl_my_class( ).
  method_name = 'MY_METHOD'.
  
  IF obj IS BOUND.
    CALL METHOD obj (method_name).
  ELSE.
    WRITE: 'Object not instantiated'.
  ENDIF.
  If MY_METHOD does not exist or is not public, the error WER158 will occur.
  
  If you provide the code snippet where the error occurs, I can help you pinpoint the exact issue.