How To Fix OO720 - The kind of component &1 cannot be changed.

OO720 - Overview

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 720

• Message text: The kind of component &1 cannot be changed.

What causes this issue?

The kind of a component (e.g., from an attribute to a type) can not be
changed.

System Response

Class Builder sends an error message and does not allow the changes.

How to fix this error?

Delete the old component.
Save and activate the class.
Create the new component.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

OO720 - Details

• The SAP error message OO720, which states "The kind of component &1 cannot be changed," typically occurs in the context of object-oriented programming in SAP, particularly when dealing with Business Object (BO) components or classes. This error indicates that there is an attempt to change the type or kind of a component that is not allowed.
  
  Cause:
  
  Incompatible Change: The error usually arises when you try to change the type of a component (e.g., from a reference to a value type or vice versa) in a way that is not permitted by the SAP system.
  Inheritance Issues: If the component is part of a class hierarchy, changing its type may violate the rules of inheritance or polymorphism.
  Existing References: If there are existing references or instances of the component, changing its type could lead to inconsistencies or errors in the program logic.
  
  
  Solution:
  
  Review Component Definition: Check the definition of the component in the class or