How To Fix OO155 - Invalid declaration type. Use 'Attribute', 'Class Attribute', 'Constant'

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 155

• Message text: Invalid declaration type. Use 'Attribute', 'Class Attribute', 'Constant'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO155 - Invalid declaration type. Use 'Attribute', 'Class Attribute', 'Constant' ?

  The SAP error message OO155 "Invalid declaration type" typically occurs in ABAP Object-Oriented programming when there is an issue with the declaration of attributes or constants in a class. This error indicates that the declaration type used is not valid or not recognized by the ABAP compiler.
  Cause:
  The error can arise from several scenarios, including:
  
  
  Incorrect Declaration Type: You may have used an invalid keyword for declaring an attribute or constant. For example, using DATA instead of ATTRIBUTE or CLASS-DATA instead of CLASS ATTRIBUTE.
  
  
  Scope Issues: If you are trying to declare an attribute or constant in a context where it is not allowed (e.g., inside a method instead of the class definition).
  
  
  Syntax Errors: There may be syntax errors in the declaration line that prevent the compiler from recognizing the declaration type.
  
  
  Solution:
  To resolve the OO155 error, you can follow these steps:
  
  
  Check Declaration Syntax:
  
  Ensure that you are using the correct keywords:
  
  Use ATTRIBUTE for instance attributes.
  Use CLASS-DATA for class attributes.
  Use CONSTANTS for constants.
  
  
  Example of correct declarations:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      DATA: my_instance_attribute TYPE string.
      CLASS-DATA: my_class_attribute TYPE string.
      CONSTANTS: my_constant TYPE string VALUE 'constant_value'.
  ENDCLASS.
  
  
  
  
  Review the Context:
  
  Make sure that you are declaring attributes and constants in the appropriate section of the class definition (i.e., within the PUBLIC SECTION, PROTECTED SECTION, or PRIVATE SECTION).
  
  
  
  Check for Typos:
  
  Look for any typographical errors in your code that might lead to the compiler not recognizing the declaration.
  
  
  
  Use the ABAP Editor:
  
  Utilize the ABAP editor's syntax check feature (Ctrl + F2) to identify and correct any syntax issues.
  
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for ABAP Object-Oriented programming for detailed information on class definitions and attribute declarations.
  SAP Community: Engage with the SAP Community forums for discussions and solutions related to similar issues encountered by other developers.
  Debugging Tools: Use debugging tools in the ABAP Workbench to step through your code and identify where the error occurs.
  
  By following these guidelines, you should be able to resolve the OO155 error and correctly declare your attributes and constants in your ABAP classes.