Values are:
* Tax on Initial Bill: Tax prepaid at time of initial bill. The initial prepaid bill is taxed, and when the row is utilized, the tax is backed out of the UTL row.
* Tax on Utilization: Tax prepaid when utilization occurs. No tax information is sent to Billing on the initial bill. When the row is utilized, the BIL row is taxed, but there is no backing out of taxes on the UTL row.