How to identify the change in the field of a screen

Hello,
In a program , i have a screen 100 with some PBO logic and PAI. sample of PAI code
chain:
structure-A,
structure-*,
module check_mandatory_fields
module return: ( this will set screen to 0 and then leave statement)
endchain
in one of the subroutines we have
if sy-batch is initial
call screen 102.
else
endif.
perform ...
perform ...
The issue is for some records the processing goes to the PAI of the screen and then returns to the calling program correctly, However few cases it never enters the PAI, there by goes to the main routine which calls this FM.
Questions
1. How do I identify there is a change in the structure-A or Structure-B values. Beacuse if check the values are the same.
2. How do i force it to always enter the PAI irrespective of the change.
Thanks and regards,
Shylaja

Hello Siva,
Thanks for the reply.
Currently the issue there is no change in any of the fields. I think thsi is the reason why the PAI is not called. Only in the PAI we have set screen to 0 and leave.
Without any change in the screen elements how do i force it to enter the PAI
or
when i call a screen statement as Call 102, how do i ensure that it returns to the call routine back irrespective of the PAI being executed.
thanks and regards,
Shylaja

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