Function Module to display hierarchy grid

Hi Gurus,

I am having a situation where there are two internal tables.

One contain header data and other items data.

the common fields in this are PO# and line item#.

What I have to do is need to display the output in grid format with header in one line from first int. table and beneath that corresponding line items of 2nd int. table should be displayed. This should go on for all entries in the internal tables.

Can anyone please let me know is there any Function module or any methods which displays in this format.

promise to reward points.

regards

Mac