Hi,
Check for the detail documentation or demo program in sap ( demo_dynpro*)
you have to handle it like below in other words
The' At Exit' is used in flow logic in module pool . When we click on back button it will bypass the required filed checks.
Code for AT EXIT-COMMAND in flow logic and in module pool program can be written as follows.
In Flow Logic:
PROCESS AFTER INPUT.
MODULE EXIT AT EXIT-COMAND.
In Module Pool Program:
MODULE EXIT.