Output of alv grid

hi all,

there is a very typicall requirement to be achieved in ALV grid display.

i need to display the subtotal of a field for which line item should not be shown.

In this case "Number of Purchase orders" should not have any line itme but it should get poplulated with the total number of Purchase order ducument number for a vendor.

here is the required ouput format

vendor number Purchase order document number Number of Purchase orders

32915 1999009090

1999009091

SUM 2

32916 1999009092

SUM 1

SUM total 2

the value to be displayed has been calculated ina variable. the problem is how to display it.

please help.