related to smartforms

hi all,

here is my code

count = 0.

loop at it_main10 into wa_main10 from cnt to a .

AT NEW zzvendor.

COUNT = 1.

ENDAT.

endloop.

a = a + 1.

this code...i have written in program lines of smartform.

but even if the vendor is same the count value is getting incremented to 1.

please solve this problem for me........