How To Fix OO151 - Invalid visibility. Use 'Public', 'Protected', or 'Private'

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 151

• Message text: Invalid visibility. Use 'Public', 'Protected', or 'Private'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO151 - Invalid visibility. Use 'Public', 'Protected', or 'Private' ?

  The SAP error message OO151 "Invalid visibility. Use 'Public', 'Protected', or 'Private'?" typically occurs in ABAP Object-Oriented programming when there is an issue with the visibility modifier of a class or method. This error indicates that the visibility of a class member (attribute or method) is not correctly defined.
  Cause:
  The error is caused by one of the following scenarios:
  
  Incorrect Visibility Modifier: You may have used an invalid visibility keyword that is not recognized by the ABAP language.
  Missing Visibility Modifier: You may have forgotten to specify a visibility modifier for a class member.
  Typographical Error: There could be a typo in the visibility keyword (e.g., misspelling "Public" as "Pubic").
  
  Solution:
  To resolve the OO151 error, follow these steps:
  
  
  Check Visibility Modifiers: Ensure that you are using one of the valid visibility keywords:
  
  PUBLIC: Members are accessible from outside the class.
  PROTECTED: Members are accessible only within the class and its subclasses.
  PRIVATE: Members are accessible only within the class itself.
  
  
  
  Add Missing Modifiers: If you have omitted a visibility modifier, add one of the valid keywords before the class member declaration.
  
  
  Correct Typos: Look for any typographical errors in the visibility keywords and correct them.
  
  
  Example:
  Here’s an example of how to correctly define visibility in a class:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      METHODS: my_public_method.
    PROTECTED SECTION.
      METHODS: my_protected_method.
    PRIVATE SECTION.
      METHODS: my_private_method.
  ENDCLASS.
  
  CLASS my_class IMPLEMENTATION.
    METHOD my_public_method.
      " Implementation code
    ENDMETHOD.
  
    METHOD my_protected_method.
      " Implementation code
    ENDMETHOD.
  
    METHOD my_private_method.
      " Implementation code
    ENDMETHOD.
  ENDCLASS.
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on object-oriented programming in ABAP, including visibility concepts.
  Best Practices: Always define visibility for class members to ensure proper encapsulation and maintainability of your code.
  Debugging: If you encounter this error, check the class definition and implementation sections for any discrepancies in visibility declarations.
  
  By following these guidelines, you should be able to resolve the OO151 error and ensure that your ABAP code adheres to the correct object-oriented principles.