From now on, you can also adapt the invoice date MRT-REI when you invoice in REI (rS Electronic Invoice). For the invoices ORD-REI, you have already this possibility since the start of ORD (Order Register Deliver).
With this approach, you have to make sure that the registered date in your accounting will be identical as the date mentioned in the electronic invoice. You don’t process invoices before handling deliveries or other assignments.
The date of the invoice is as mentioned in the newly legislation, legal guideline for the content of the VAT declaration of the client and supplier. The electronic invoice remains the legal invoice. This electronic invoice is at your disposal during 11 calendar years, for you supplier and for your client.