Terminate Program after displaying Pop-up in ME_PROCESS_PO_CUST

I have created an implicit enhancement in ME_PROCESS_PO_CUST, CHECK method to display a pop-up with all the PO quantities added up.

However, when I select NO or CANCEL in the pop-up it is required to take me back to the PO screen to edit the PO quantities.

I am unable to do that, and I have tried the below ways to achieve the same but did not succeed:

SET SCREEN, LEAVE TO SCREEN

MESSAGE <msg> TYPE 'I' DISPLAY LIKE 'E'

EXIT, STOP

LEAVE TO CURRENT TRANSACTION

MESSAGE <msg> TYPE 'A'

Any help would be appreciated!