NAV2017 T36 Sell-To Customer Name unexpected behavior

Sell-to Customer Name - OnValidate()
VALIDATE("Sell-to Customer No.",Customer.GetCustNo("Sell-to Customer Name"));

Right, so now you can never change the customer name on an order on an invoice in case you want to use a share customer account, like "Cash & Carry" or "Staff Purchase" or "Webshop" because it is always interpreted as changing the Customer No.? Seriously, Microsoft?

Now I have to go and change the table behavior and the pages (because they are not showing the Customer No. anymore) back to NAV2017

Seriously. Did anyone think this through?