How To Fix OO064 - TYPE is not allowed in classes or interfaces

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 064

• Message text: TYPE is not allowed in classes or interfaces

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO064 - TYPE is not allowed in classes or interfaces ?

  The SAP error message "OO064 TYPE is not allowed in classes or interfaces" typically occurs in ABAP Object-Oriented programming when you attempt to use a data type that is not permitted in the context of a class or interface definition. This error can arise from various situations, such as using a non-object type or an incorrect data type in a class or interface.
  Causes:
  
  Invalid Data Type: You may be trying to declare a variable or parameter with a data type that is not allowed in the context of a class or interface. For example, using a non-object type (like a standard data type) in a class or interface definition.
  Incorrect Syntax: There might be a syntax error in the way the type is defined or declared.
  Use of Non-Object Types: In ABAP OO, only reference types (like classes, interfaces, or data references) are allowed in class or interface definitions.
  
  Solutions:
  
  
  Check Data Types: Ensure that you are using valid object types (like classes or interfaces) in your class or interface definitions. Replace any non-object types with appropriate reference types.
  Example:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      DATA my_data TYPE REF TO my_other_class. " Correct usage
  ENDCLASS.
  
  
  Review Syntax: Double-check the syntax of your class or interface definition. Make sure that all declarations conform to the ABAP OO standards.
  
  
  Use of Data References: If you need to use standard data types, consider using data references instead. You can create a reference to a standard data type and use that in your class or interface.
  Example:
  DATA: my_value TYPE i,
        my_ref   TYPE REF TO data.
  
  CREATE DATA my_ref TYPE i.
  
  
  Consult Documentation: If you are unsure about the types allowed in classes or interfaces, refer to the official SAP documentation or ABAP programming guidelines for more information.
  
  
  Related Information:
  
  ABAP Object-Oriented Programming: Familiarize yourself with the principles of ABAP OO, including how to define classes, interfaces, and the types of data that can be used.
  SAP Notes and Community: Check SAP Notes or community forums for similar issues and solutions shared by other developers.
  Debugging: Use the ABAP debugger to step through your code and identify where the error is occurring, which can help you pinpoint the exact cause.
  
  By following these guidelines, you should be able to resolve the OO064 error and ensure that your class or interface definitions are valid.