How To Fix FDT_EXPRESSIONS636 - &1 is not of type data object, can't be used as changing parameter

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 636

• Message text: &1 is not of type data object, can't be used as changing parameter

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS636 - &1 is not of type data object, can't be used as changing parameter ?

  The SAP error message FDT_EXPRESSIONS636 indicates that there is an issue with the type of a variable being used as a changing parameter in a function module or method. Specifically, the error message states that the variable (denoted by &1) is not of the expected type "data object," which means it cannot be used as a changing parameter.
  Cause:
  
  Incorrect Data Type: The variable you are trying to use as a changing parameter is not of the correct data type. Changing parameters in SAP must be of a specific type that allows for modification.
  Variable Declaration: The variable may not have been declared properly or may have been declared as a constant or a different type that does not allow for changes.
  Contextual Misuse: The variable might be used in a context where it is not expected to be a changing parameter, such as in a function module that does not support changing parameters.
  
  Solution:
  
  Check Variable Type: Ensure that the variable you are using as a changing parameter is declared as a data object. You can do this by checking the data type in the ABAP Dictionary or in the code where the variable is declared.
  Modify Declaration: If the variable is declared incorrectly, modify its declaration to ensure it is of the correct type. For example, if it is declared as a constant, change it to a variable.
  Review Function Module/Method: Check the definition of the function module or method you are calling to ensure that it is designed to accept changing parameters. If it does not, you may need to refactor your code to use a different approach.
  Debugging: Use debugging tools in SAP to trace the execution and see where the variable is being set and passed. This can help identify the point of failure.
  
  Related Information:
  
  Changing Parameters: In SAP ABAP, changing parameters are used to pass data to a function module or method that can be modified within that function. They are defined in the function module interface.
  Data Object Types: Common data object types include simple types (like integers, strings), structures, and internal tables. Ensure that the variable you are using matches the expected type.
  SAP Documentation: Refer to the official SAP documentation for more details on function module parameters and data types.
  
  If you continue to face issues, consider reaching out to your SAP support team or consulting the SAP community for further assistance.