How To Fix PG456 - Generating code overwrites any changes already made to screen structure

PG456 - Overview

• Message type: E = Error

• Message class: PG - Error Messages for Master Data Programs

• Message number: 456

• Message text: Generating code overwrites any changes already made to screen structure

What causes this issue?

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

System Response

How to fix this error?

"Generate Code" results in several objects being regenerated and
previous changes being overwritten. Therefore, you should use this
function only if the relevant screen structure fields are identical with
the PS structure fields. Otherwise all objects should be processed
individually.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

PG456 - Details

• The SAP error message PG456, which states "Generating code overwrites any changes already made to screen structure," typically occurs when you attempt to generate a screen in an SAP program that has already been modified. This message serves as a warning that any manual changes made to the screen layout or structure will be lost if you proceed with the generation.
  
  Cause:
  
  Manual Changes: The screen has been manually modified in the Screen Painter or through other means, and generating the screen will overwrite these changes.
  Screen Generation: You are trying to generate a screen (e.g., after making changes in the ABAP Workbench) without saving or properly managing existing modifications.
  
  
  Solution:
  
  Save Changes: Before generating the screen, ensure that you have saved any changes you want to keep. If you have made manual changes, consider documenting them or taking screenshots.
  Review Modifications: Check the screen structure for any modifications that may be lost. If necessary, revert