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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message PG456 - Generating code overwrites any changes already made to screen structure ?

  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 to the previous version of the screen or make a backup of the current state.
  Use the Screen Painter: If you need to make changes, use the Screen Painter to modify the screen layout and then generate it. This way, you can ensure that your changes are preserved.
  Generate with Caution: If you are sure that you want to proceed with the generation and do not need the existing changes, you can continue with the generation process. However, be aware that any unsaved changes will be lost.
  
  Related Information:
  
  Screen Painter: This is the tool used in SAP to design and modify screens. Familiarity with this tool can help prevent issues related to screen generation.
  ABAP Workbench: Understanding the ABAP Workbench and its components can help you manage your developments more effectively.
  Version Control: Implementing a version control strategy for your ABAP developments can help you track changes and revert to previous versions if necessary.
  SAP Notes: Check SAP Notes for any specific guidance or updates related to this error message, as there may be patches or recommendations from SAP.
  
  If you continue to encounter issues or if the error persists, consider reaching out to your SAP Basis or development team for further assistance.