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

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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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