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ME81N PBO is not triggering for subscreen

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I need to add one custom tab at header level in T-code ML81N which will having one field. Now the field will be in display mode when value will be populated.

I have already added one custom tab & field at header level using SRVEUSCR Custom Screen exit & also the value is getting populated successfully. But for making the field in display mode need to modify screen at PBO.

But the problem is pbo is not getting triggered at all.. Can anyone please tell me what reason it could be ?

I need your valuable suggestions plz.


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first u need to declare the Module in PROCESS BEFORE OUTPUT.

after that u need to call the module where u want it to be triggred.

and there u can write ur logic.

a screen shot of ur cood will help us to see the problem