Generating XML without price and quantity

Hi,
Our client is a telecommunications company and provides voice interconnect services to other telecom companies. The invoice to the other telecom companies is raised based on the minutes used. The rate of charges for each country is different and the billing is made consolidated for all countries in a single invoice line.
Due to this, it is not possible to provide the quantity and the unit price for the charges. Please suggest how this issue can be addressed as the unit price and quantity are mandatory.

Regards
Vivek Kedia

Why not fix the quantity to “1” and then put the unit price value = the total of that line item.