How To Fix OO_SOURCE_BASED101 - The source-based Class Builder can edit only standard classes/interfaces.

SAP Error Message - Details

• Message type: E = Error

• Message class: OO_SOURCE_BASED - WB - Class Builder - Messages for the source-b. Class Editor

• Message number: 101

• Message text: The source-based Class Builder can edit only standard classes/interfaces.

What causes this issue?

You have selected the source-based Class Builder in your user Settings
(Utilities->Settings...->Class Builder) as your default tool.
You have opened a class (e.g., an exception class) or an interface which
can not be edited by the source-based Class Builder.

System Response

The form-based Class Builder will be opened for the class or the
interface.

How to fix this error?

You can edit the class in the from-based Class Builder.

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO_SOURCE_BASED101 - The source-based Class Builder can edit only standard classes/interfaces. ?

  The SAP error message OO_SOURCE_BASED101 indicates that you are trying to edit a class or interface that is not a standard class or interface using the Source-Based Class Builder. This typically occurs when you attempt to modify a class or interface that is either a custom class or an interface that is not part of the standard SAP delivery.
  
  Cause:
  
  Non-Standard Class/Interface: The class or interface you are trying to edit is not a standard SAP class/interface. The Source-Based Class Builder is designed to work only with standard classes/interfaces.
  Incorrect Access Method: You might be using the wrong method to access or edit the class/interface. For example, trying to edit a custom class in a way that is reserved for standard classes.
  
  
  Solution:
  
  Check Class/Interface Type: Verify if the class or interface you are trying to edit is indeed a standard one. You can do this by checking the class/interface name in the SAP system.
  Use