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Question on ABAP debugger call stack - Transaction, PBO screen, PBO screen

0 Kudos

When I put a breakpoint in the ABAP code and run the program, the first things I see on the call stack are these:

Transaction

PBO Screen

PBO Module

Can anyone explain what exactly they are?

2 REPLIES 2

maheshpalavalli
Active Contributor

Hi Ikim SS,

Your application is a module pool based application and that is the reason why you are able to see PBO & PAI, sometimes POH & POV too.

PBO -> Process before output ->PBO is triggered before the screen is displayed .

PAI -> Process After Input -> PAI is triggered after a user action on the screen

You can find many blogs in SCN about Module pool programming and even in SAP help.

https://archive.sap.com/discussions/message/4885628#4885628

BR,

Mahesh

raymond_giuseppi
Active Contributor
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Did you look in online help or your Abap course materials for the 'Process Before Output' dynpro event?