Have contract and invoice number match the request number

As the system exists currently, contracts, invoices, and requests all have different numbers. It would be great to see more connection between these, as they are almost always tied together. If a contract is based on a request, it should use the first request number in the series. Same for invoices. If multiple versions are created, add a separate identifier.

For example, if I place a request for spaces X and Y which creates requests 36271 and 36272, have the contract be number 36271 and invoice also be 36271. If an invoice is canceled and rebuilt, instead of increasing the number, change to Invoice 36271-2, or -3 etc as many version as needed.