How To Fix OO153 - Invalid declaration type. Use 'Method' or 'Class Method'

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 153

• Message text: Invalid declaration type. Use 'Method' or 'Class Method'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO153 - Invalid declaration type. Use 'Method' or 'Class Method' ?

  The SAP error message OO153, which states "Invalid declaration type. Use 'Method' or 'Class Method'?", typically occurs in ABAP Object-Oriented programming when there is an issue with the declaration of a method in a class or interface. This error indicates that the method declaration is not correctly specified according to the expected syntax.
  Cause:
  
  Incorrect Method Declaration: The method may be declared incorrectly in the class or interface. For example, using an invalid keyword or syntax that does not conform to the ABAP OO standards.
  Missing Keywords: The keywords METHOD or CLASS METHOD may be missing in the method declaration.
  Scope Issues: The method might be declared in a context where it is not allowed, such as outside of a class or interface definition.
  
  Solution:
  To resolve the OO153 error, you should:
  
  
  Check Method Declaration: Ensure that the method is declared correctly. The correct syntax for a method declaration in a class is as follows:
  CLASS class_name DEFINITION.
    PUBLIC SECTION.
      METHODS: method_name.
  ENDCLASS.
  
  CLASS class_name IMPLEMENTATION.
    METHOD method_name.
      " Method implementation
    ENDMETHOD.
  ENDCLASS.
  For a class method, the syntax is:
  CLASS class_name DEFINITION.
    PUBLIC SECTION.
      CLASS METHODS: method_name.
  ENDCLASS.
  
  CLASS class_name IMPLEMENTATION.
    METHOD method_name.
      " Method implementation
    ENDMETHOD.
  ENDCLASS.
  
  
  Use Correct Keywords: Make sure you are using METHOD for instance methods and CLASS METHOD for static methods.
  
  
  Check for Typos: Look for any typographical errors in the method name or keywords.
  
  
  Review Class/Interface Context: Ensure that the method is declared within the appropriate class or interface context.
  
  
  Syntax Check: Use the syntax check feature in the ABAP editor (transaction SE80 or SE38) to identify any other potential issues in your code.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for ABAP Object-Oriented programming for detailed information on method declarations and class definitions.
  SAP Community: Engage with the SAP Community forums for discussions and solutions related to similar issues.
  ABAP Development Tools: Utilize tools like ABAP Development Tools (ADT) in Eclipse for better code management and error detection.
  
  By following these steps, you should be able to resolve the OO153 error and correctly declare your methods in ABAP.