Subtotal in ALV

Hi,

I want to subtotaling on two different columns in ALV by sorting single or multiple columns. I have tried by following piece of code.

ls_sort-fieldname = document no.

ls_sort-subtot = X.

ls_sort-up = abap_true.

and for field catalog

*Field SETT_NET_AMOUNT

WHEN totalamount

<ls_fieldcat>-do_sum = X.

*Field WRBTR

WHEN ap/ar amount.

<ls_fieldcat>-do_sum = X.

But in this case both the subtotal displayed in different row.

Please suggest any solution so that both subtotal will be displayed in same row

Thanks

Sandeep Kumar Singh