How to apply loop 2 times in table of smart-forms ?

Hi,

I developed a Smart form but data is not coming properly in Item table(body) ?

I run this smart-form by driver program, I have two internal tables one for header data another for item data,

I debug both tables, my data is coming correctly..

then I created structure for both tables and pass this structure in SM .

after that I passed loop(for header data) in table(under data tab)  loop i_tab to WA.

then I passed 2nd loop for item data in main body(create a loop)  loop j_tab to WA

after that(I execute drive program) my output is coming this type

PO no             Po type              date

item                quantity             amount

30006             BS                       22.11.2007              <---header data is coming properly

3                       kg                         3770.5                <--- but item data its showing only last records

i want print herder data under their item data , but problem is that, the herder data is coming correctly but not coming item data properly

. i Checked my item data internal table(its have 3 records) but in output its showing only last record.

how to solve this problem ?

thanks