In case of shipping the products for the so-called dropshipping company (outside online store selling your products, while you are shipping them), transfer of orders can be limited to existing MK products. If the MK product code and product SKU from the online store match, the order will be transferred to MK. Otherwise, an error will occur and the order will not be transferred.
If products belonging to the order are mixed (some of them are already in MK, while some of them are not) then the order will also be omitted. Namely, the condition is for all products to already be inside MK.