Vendor balance confirmation

I am working on script of vendor balance confirmation form.

The form is F130_CONFIRM_01 .I have copied this form and changed according to my requirment and

attatched it to the program .

Here i am displaying only total vendor balance as per the fomat letter but i dont want to show those vendor who do not have any balance but its coming in my form with zero of the vendor who have no balance.

so please tell me how to do this.

thanks.