Please contact us by email to get support for the billing module. Your problem is related to the date format settings in your installation that happen when the billing module date fomat do not match eith the date format of the language you had selected.
The rev 1 version has no no vat template, it has been introduced in rev2. So most likely your system datsbase is not correctly updated.
Last edited by till; 28th December 2011 at 22:50.