On the Order form in the Order entity, the Customer ID lookup field had to be used. D365 won't allow you to remove it as it's locked to the form by the system or make it 'Optional' in the Field Requirement section (default is Business Required) as it has to contain a Contact or Account so I can't hide it.
I am trying to link new contacts made through the Customer ID field to the Order form and display them in a subgrid. Other lookup fields allow you to edit the 'Related Records Filtering' section (see below) but the Customer ID field doesn't have that option.
Can anyone advise how I would add multiple contacts to the order form in a subgrid please or if I should do it another way?