How To Fix OO_SOURCE_BASED103 - Modification Assistant can not be used by the source-based Class Builder.

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: 103

• Message text: Modification Assistant can not be used by the source-based Class Builder.

What causes this issue?

You have selected the source-based Class Builder in your user Settings
(Utilities->Settings...->Class Builder) as your default tool.
The Modification Assistant is enabled for the class or the interface
which you have opened. The source-based Class Builder does not support
the Modification Assistant.

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 form-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_BASED103 - Modification Assistant can not be used by the source-based Class Builder. ?

  The SAP error message "OO_SOURCE_BASED103: Modification Assistant can not be used by the source-based Class Builder" typically occurs when you are trying to use the Modification Assistant in a context where it is not applicable, particularly when working with source-based class definitions in ABAP Object-Oriented programming.
  Cause:
  
  Source-Based Class Builder: The error indicates that you are attempting to use the Modification Assistant with a source-based class. The Modification Assistant is designed for use with the graphical class builder (Class Builder transaction SE24) and not with source-based classes (which are defined in the ABAP Editor).
  Incompatibility: The Modification Assistant is not compatible with certain types of class definitions, particularly those that are defined directly in the source code rather than through the Class Builder interface.
  
  Solution:
  
  Use Class Builder: If you need to modify a class, ensure that you are using the Class Builder (transaction SE24) instead of editing the class directly in the ABAP Editor (transaction SE38 or SE80).
  Check Class Type: Verify if the class you are trying to modify is indeed a source-based class. If it is, you will need to make changes directly in the source code without using the Modification Assistant.
  Manual Changes: If you need to make modifications, you can do so manually in the ABAP Editor. Be cautious with your changes to ensure that they do not disrupt the existing functionality.
  Consult Documentation: Refer to SAP documentation or help resources for more information on the specific class and its structure.
  
  Related Information:
  
  ABAP Class Types: Understand the difference between source-based classes and those created through the Class Builder. Source-based classes are typically more flexible but may lack some of the features provided by the Class Builder.
  Modification Assistant: Familiarize yourself with the capabilities and limitations of the Modification Assistant, as it is a tool designed to help manage modifications in a controlled manner.
  SAP Notes: Check for any relevant SAP Notes that may address this error or provide additional context or solutions.
  
  If you continue to experience issues or if the error persists, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.