How To Fix FDT_EXPRESSIONS841 - Usage of importing parameter &1 is only allowed by using type &2

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 841

• Message text: Usage of importing parameter &1 is only allowed by using type &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS841 - Usage of importing parameter &1 is only allowed by using type &2 ?

  The SAP error message FDT_EXPRESSIONS841 indicates that there is an issue with the usage of an importing parameter in a function module or method. Specifically, it states that the importing parameter &1 is being used incorrectly and can only be used with a specific type &2. This error typically arises in the context of using the SAP Fiori Development Toolkit or when working with expressions in the context of SAP's Flexible Data Model.
  Cause:
  
  Type Mismatch: The importing parameter is being passed a value that does not match the expected data type. For example, if the parameter is defined to accept a certain type (like a structure or a specific data type), but a different type is being passed, this error will occur.
  Incorrect Function Call: The function module or method may be called incorrectly, leading to the wrong type being passed as an argument.
  Configuration Issues: There may be issues in the configuration of the function module or method that define how parameters should be used.
  
  Solution:
  
  Check Parameter Types: Review the definition of the function module or method to ensure that the data type of the importing parameter matches what is being passed. You can do this by checking the ABAP Dictionary (SE11) or the function module definition (SE37).
  Correct Function Call: Ensure that the function module or method is being called with the correct parameters. If you are using a wrapper or a custom implementation, verify that the parameters are being passed correctly.
  Data Conversion: If necessary, convert the data to the expected type before passing it to the function/module. This can be done using appropriate ABAP data conversion functions.
  Debugging: Use the ABAP debugger to step through the code and inspect the values and types of the parameters being passed to identify where the mismatch occurs.
  Documentation: Refer to the SAP documentation for the specific function module or method to understand the expected parameter types and usage.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE37 (Function Module) or SE80 (Object Navigator) to explore the function module or method in question.
  ABAP Data Types: Familiarize yourself with ABAP data types and structures to ensure proper usage.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide additional guidance related to this error message.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.