Answer Posted / shatrughan singh

Flow logic : Code that processes a particular screen in the R/3 System.Flow logic statements are syntactically similar to ABAP statements, but you cannot use flow logic keywords in ABAP.
You define flow logic in the flow logic editor of the Screen Painter. Flow logic comprises four modules:
• PBO (Process Before Output)
• PAI (Process After Input)
• POV(Process On value request)
• POH(Process On Help request)
PBO : The processing of screen before the screen is displayed is done in this event. (event is triggered before the screen is displayed).
PAI : This event is responsible for processing of screen after the user enters the data and clicks the pushbutton.
POV : This is triggered when user clicks F4 function key (for listing all possible values for the field).
POH : This event is triggred when user places the cursor on field and press F1 , by default system displays its own HELP for that particular field one can add his own HELP by writting in POH.

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