How To Fix PG377 - Screen &1 of program &2 is not a list screen; function is not possible

PG377 - Overview

• Message type: E = Error

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

• Message number: 377

• Message text: Screen &1 of program &2 is not a list screen; function is not possible

What causes this issue?

Your attempt to generate the overview screen was unsuccessful because
screen &1 is not an overview screen.

System Response

The function is not permissible.

How to fix this error?

Please check screen &1 in program &2. Also check your entries.

Error message extract from SAP system. Copyright SAP SE.

PG377 - Details

• The SAP error message PG377 indicates that the program you are trying to execute is not displaying a list screen, which is required for certain functions to work. This error typically occurs when you attempt to perform an action that is only valid in a list context, such as selecting multiple entries or using list-specific functions (like sorting or filtering) on a screen that does not support these features.
  
  Cause:
  
  Non-List Screen: The screen you are on is not designed to display a list of items. It may be a single-item screen or a dialog screen.
  Incorrect Program Logic: The program may have been incorrectly designed or configured, leading to the display of a non-list screen when a list screen is expected.
  User Action: The user may have attempted to execute a function that is only applicable to list screens, such as selecting multiple entries or using list navigation.
  
  
  Solution:
  
  Check the Screen Type: Verify that