I did up a support contract (SLA) dealing with various topics, and raised an invoice for year one. Do I need to reissue the support contreact with the dates updated for year two? What is the norm here, is the invoice enough?
I believe the invoice is sufficient providing none of the terms of the contract have changed.
Invoice should be provided in plenty of time to allow customer cancellation e.g. about 30 days before contract ends.