can anyone let me know as how to find the attributes of the events listed in classic ALV say for example take the example event 'BEFORE_LINE_OUTPUT', now can we know the attributes of this event? likewise for other events
"learning by debugging"
just activate those events and implement according form-routines in your program only containing a break-point.
When alv tries to perfom your form routines you will get a dump. Now you can find out how ALV calls the routine.