Thanks guys for your fruitful replies, as most of you asked the main purpose of my question, the answer is as follows:
in fact my purpose to do so is to create a function module that can fetch data dynamically from different database tables based on the codings in different abap program.
for example: in one abap program i am coding as follows:
tables: kna1.
types: begin of itab,
kunnr type kna1-kunnr,
name1 type kna1-name1,
end of itab.
data: it_tab type standard table of itab,
wa_tab type itab.
similarly in other program i am coding as follows:
tables: vbrp.
types: begin of itab,
posnr type vbrp-posnr,
matnr type vbrp-matnr,
arktx type vbrp-arktx,
end of itab.
data: it_tab type standard table of itab,
wa_tab type itab.
so now for both programs i want to call the same function module and fetch data as required in relative programs as mentioned above. in that case how to create that function module?