How To Fix FL321 - Do not use import and export parameters of the same name

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 321

• Message text: Do not use import and export parameters of the same name

What causes this issue?

You have attempted to create or change a parameter that is defined as
an import or export parameter. As of the next Release, this is no
longer supported.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The process has been terminated.

How to fix this error?

Use changing parameters instead. If an urgent change is made to an
existing parameter, use the old version of the Workbench.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL321 - Do not use import and export parameters of the same name ?

  The SAP error message FL321, which states "Do not use import and export parameters of the same name," typically occurs in ABAP function modules or methods when there is a naming conflict between import and export parameters. This can lead to ambiguity in the function's interface, making it unclear whether a parameter is being passed in or returned.
  Cause:
  The error arises when:
  
  A function module or method defines both an import parameter and an export parameter with the same name.
  This can create confusion in the code, as it is not clear whether the parameter is being used for input or output.
  
  Solution:
  To resolve this error, you should:
  
  
  Rename Parameters: Change the name of either the import or export parameter so that they are distinct. This will eliminate the ambiguity and comply with SAP's naming conventions.
  For example, if you have:
  IMPORTING
    iv_parameter TYPE string,
  EXPORTING
    ev_parameter TYPE string.
  You could rename them to:
  IMPORTING
    iv_input_parameter TYPE string,
  EXPORTING
    ev_output_parameter TYPE string.
  
  
  Review Function Module/Method Design: Ensure that the design of your function module or method is clear and that parameter names are meaningful and descriptive. This will help avoid similar issues in the future.
  
  
  Check for Other Naming Conflicts: After renaming, ensure that there are no other naming conflicts within the function module or method.
  
  
  Related Information:
  
  Best Practices: It is a good practice to use prefixes or suffixes to differentiate between input and output parameters (e.g., iv_ for input and ev_ for output).
  Documentation: Always document the purpose of each parameter in the function module or method to enhance clarity for future developers.
  Testing: After making changes, thoroughly test the function module or method to ensure that it behaves as expected and that the changes do not introduce new issues.
  
  By following these steps, you should be able to resolve the FL321 error and improve the clarity and maintainability of your ABAP code.