How To Fix FDT_EXPRESSIONS843 - Typing of importing parameter &1 has to be of 'TYPE REF TO'

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 843

• Message text: Typing of importing parameter &1 has to be of 'TYPE REF TO'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS843 - Typing of importing parameter &1 has to be of 'TYPE REF TO' ?

  The SAP error message FDT_EXPRESSIONS843 indicates that there is a type mismatch in the ABAP code, specifically related to the importing parameter of a method or function module. The error message states that the importing parameter &1 must be of type REF TO, which means it should be a reference to an object.
  Cause:
  This error typically occurs when:
  
  An importing parameter is defined in a method or function module that expects a reference to an object (i.e., a reference type), but the actual argument passed to it is not of that type.
  The parameter is incorrectly defined in the method signature or the calling code does not match the expected type.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Method/Function Module Definition:
  
  Review the definition of the method or function module where the error occurs. Ensure that the importing parameter is indeed defined as a reference type (e.g., TYPE REF TO <class>).
  
  
  
  Check Calling Code:
  
  Look at the code where the method or function module is being called. Ensure that the argument being passed to the importing parameter is a reference to an object of the expected type.
  If you are passing a value type (like a structure or a simple data type), you need to create an instance of the object and pass that instead.
  
  
  
  Create Object Instance:
  
  If you need to pass an object reference, make sure to instantiate the object before passing it. For example:
  DATA: lo_object TYPE REF TO <class>.
  CREATE OBJECT lo_object.
  CALL METHOD <method_name>
    EXPORTING
      parameter_name = lo_object.
  
  
  
  
  Check for Type Compatibility:
  
  Ensure that the type of the object you are passing is compatible with the expected type of the importing parameter.
  
  
  
  Related Information:
  
  ABAP Object-Oriented Programming: Understanding how object references work in ABAP is crucial. Familiarize yourself with concepts like classes, instances, and reference types.
  Debugging: Use the ABAP debugger to step through the code and inspect the types of variables being passed to the method or function module.
  Documentation: Refer to the SAP documentation for the specific method or function module to understand the expected parameter types.
  
  By following these steps, you should be able to identify and correct the cause of the error message FDT_EXPRESSIONS843 in your SAP ABAP code.