Enable a billing requirement to be waived for one contract for the current invoice only

This would address the problem that there is no way to set up a billing requirement that is applicable to every single billing except for the first one. This would also help us use the 'Require' setting more often and more effectively. It is very time consuming when requirements set as 'Suggest' are ignored and the payment application has to either be rejected and resubmitted IN ITS ENTIRETY (a separate but equally frustrating issue) or the few missing billing documents have to be requested and collected via email outside of the platform.