Raise a charge against a tenancy

Files one notice on the signed-in owner’s account. The number is assigned here, off the numbers already filed, and the row id carries it, so two sessions raising a charge in the same moment cannot mint the same number: the second is refused by storage and retried on the next one. VAT is read from the jurisdiction pack the building stands under, and a charge whose treatment nobody has confirmed is refused rather than written at zero, because a notice that should have carried VAT leaves the owner owing the tax out of what the tenant paid. vatRate is how the owner states it themselves. Every amount is integer cents.