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

OO155 - Overview

• 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