smartforms

In smartforms, I would like to take parameter in initialization table.but its saying that it could not take parameters.so indriver program its taking parameters of different value.

for example In initialization

select matnr audat auart from matnr into corresponding fields of table lt_mara where matnr = '000000000000000038'.

but it must take matnr = p_matnr in given select statement. for a given parameter