Invoice date validation of final invoices

Status Quo:
The invoice date of a final invoice can be earlier than the date of an associated partial invoice.

Future:
The invoice date of a final invoice must be on the same day or later than the highest date of the associated partial invoices.

Affected endpoints:

• POST /api/v1/Voucher/Factory/saveInvoice/

If you want to create invoices from orders you should use
POST /api/v1/Invoice/Factory/createInvoiceFromOrder

Release: 05.09.2023 (4.162)