How To Fix EU379 - Interface methods cannot be documented within classes

SAP Error Message - Details

• Message type: E = Error

• Message class: EU - Development Environment

• Message number: 379

• Message text: Interface methods cannot be documented within classes

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• What is the cause and solution for SAP error message EU379 - Interface methods cannot be documented within classes ?

  The SAP error message EU379, which states "Interface methods cannot be documented within classes," typically occurs when you attempt to document methods of an interface within a class implementation. In ABAP (Advanced Business Application Programming), interfaces and classes have different rules regarding documentation.
  Cause:
  The error arises because:
  
  In ABAP, methods defined in an interface cannot have documentation (comments) added directly within a class that implements the interface. Documentation for interface methods should be provided in the interface definition itself, not in the implementing class.
  
  Solution:
  To resolve this error, you should:
  
  Document in the Interface: Ensure that you provide the necessary documentation for the interface methods directly in the interface definition. This is where the documentation should reside.
  Remove Class-Level Documentation: If you have added documentation for the interface methods in the class implementation, remove that documentation. Instead, focus on documenting the class-specific methods or any additional functionality that the class provides beyond the interface.
  
  Related Information:
  
  Interface Definition: When defining an interface in ABAP, you can use the METHODS keyword to declare methods and provide documentation for each method directly in the interface.
  Class Implementation: When implementing an interface in a class, you use the INTERFACES keyword to specify which interfaces the class implements. The methods from the interface are then implemented in the class without additional documentation.
  Best Practices: Always ensure that your documentation is clear and concise in the interface definition, as this will help other developers understand the purpose and usage of the methods when they are implemented in various classes.
  
  Example:
  Here’s a simple example to illustrate the correct approach:
  Interface Definition:
  INTERFACE if_example.
    " This method does something important
    METHODS do_something.
  ENDINTERFACE.
  Class Implementation:
  CLASS cl_example IMPLEMENTATION.
    METHOD if_example~do_something.
      " Implementation of the method
    ENDMETHOD.
  ENDCLASS.
  In this example, the documentation for the do_something method is placed in the interface definition, and there is no documentation in the class implementation, which adheres to the rules and avoids the EU379 error.