How To Fix ACI_COMPILER_GENERIC055 - Macro '&1' is already defined

SAP Error Message - Details

• Message type: E = Error

• Message class: ACI_COMPILER_GENERIC - EXPERIMENTAL, DON'T USE (ACI: Generic Compiler Messages)

• Message number: 055

• Message text: Macro '&1' is already defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ACI_COMPILER_GENERIC055 - Macro '&1' is already defined ?

  The SAP error message ACI_COMPILER_GENERIC055, which states that "Macro '&1' is already defined," typically occurs during the compilation of ABAP code when there is a conflict due to a macro being defined multiple times. This can happen in various scenarios, such as when a macro is defined in multiple include files or when it is defined in the same program or class.
  Cause:
  
  Duplicate Macro Definition: The macro is defined more than once in the same scope or in included files that are processed together.
  Include Files: If multiple include files are used and they define the same macro, this can lead to conflicts.
  Conditional Compilation: If macros are conditionally defined and the conditions overlap, it can lead to multiple definitions.
  
  Solution:
  
  Check Macro Definitions: Review the code to identify where the macro is defined. Ensure that it is defined only once in the relevant scope.
  Use Conditional Compilation: If the macro needs to be defined in different contexts, consider using conditional compilation directives to prevent multiple definitions.
  IF NOT defined( macro_name ).
    DEFINE macro_name.
    " Macro code here
  ENDIF.
  
  Refactor Code: If the macro is defined in multiple include files, consider refactoring the code to avoid this situation. You might want to centralize the macro definition in a single include file.
  Remove Redundant Definitions: If you find that the macro is not needed in certain places, remove the redundant definitions.
  
  Related Information:
  
  Macro Definition Syntax: Ensure that you are familiar with the syntax for defining macros in ABAP.
  Include Files: Understand how include files work in ABAP and how they can lead to multiple definitions if not managed properly.
  Debugging: Use the ABAP debugger or syntax check tools to trace where the macro is being defined and used.
  
  By following these steps, you should be able to resolve the ACI_COMPILER_GENERIC055 error and prevent it from occurring in the future.