How To Fix AC420 - You are changing over to the display mode. Screen layout rules not saved

SAP Error Message - Details

• Message type: E = Error

• Message class: AC - Error messages from Asset Customizing

• Message number: 420

• Message text: You are changing over to the display mode. Screen layout rules not saved

What causes this issue?

You are changing from maintenance mode to display mode.

System Response

You made changes to the screen layout rule. These changes cannot be
saved in display mode.

How to fix this error?

If you want to save your screen layout rule, you can either
Do so immediately
Return to change mode
Warning:
If you are in display mode, the system does not inform you of the loss
of data when you leave processing (Exit, Back or Cancel).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AC420 - You are changing over to the display mode. Screen layout rules not saved ?

  The SAP error message AC420, which states "You are changing over to the display mode. Screen layout rules not saved," typically occurs in the context of Asset Accounting (FI-AA) when a user attempts to switch from edit mode to display mode without saving changes made to the screen layout rules.
  Cause:
  
  Unsaved Changes: The primary cause of this error is that there are unsaved changes in the screen layout rules. When you try to switch to display mode, SAP prompts this message to inform you that any modifications you made will not be saved.
  User Action: The user may have inadvertently attempted to switch modes without saving their work.
  System Configuration: In some cases, the system configuration or user authorizations may also lead to this message if the user does not have the necessary permissions to save changes.
  
  Solution:
  
  Save Changes: Before switching to display mode, ensure that you save any changes you have made to the screen layout rules. Look for a "Save" button or use the keyboard shortcut (usually Ctrl + S) to save your changes.
  Review Changes: If you do not want to save the changes, you can simply cancel the operation or revert to the previous state before switching modes.
  Check Authorizations: If you believe you should be able to save changes but cannot, check with your SAP administrator to ensure you have the necessary authorizations to modify and save screen layout rules.
  Consult Documentation: If the issue persists, refer to SAP documentation or help resources for further guidance on screen layout rules and their management.
  
  Related Information:
  
  Screen Layout Rules: These rules define how fields are displayed in the asset accounting screens. They can be customized based on user roles or specific requirements.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as AS01 (Create Asset), AS02 (Change Asset), and AS03 (Display Asset) to understand where this error might occur.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its system, and there may be specific notes addressing this issue.
  
  If you continue to experience difficulties, consider reaching out to your SAP support team for further assistance.