˙PBO:Process before Output, modules are executed before displaying a screen, used to display the fields from the program to the screen, and we build the gui statuses in this PBO

˙PAI:Process After Input, modules are executed after inputting any value on a screen, used to write the code for the User actions on the screen, here data moves from screen to program.

 

來源:

http://scn.sap.com/thread/493726

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