How to get the values from form calls in user exit?

Hi all,
I am not getting a specific value readily in an user exit.
?Can any one tell me how to find what are the fields,tables available in various form calls(visible while debugging) in an user exit.
For example sapxkl is one ofthe callls...(sapxkl)<table>[] will hold some data.how to find what r the values available for <table>.
Thanks.
Edited by: sanjay_ask on Apr 16, 2010 10:43 PM

HI ,
Use this line of code
field-symbols: <l_fs> type any.
data: l_value type char20.
Get Plant
l_value = '(SAPLCEI0)GV_WERKS'. " Here give the program name and variable name
assign (l_value) to <l_fs>.
v_werks = <l_fs>. " Instead of V_werks use you internal table
Thanks
Subhankar

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