Add "Parcel/Large letter" as a valid combination for products in the catalogue for Package size (domestic / international)
For UK orders we send everything via RM tracked 24 and 48 services using the tracked 24/48 LBT (letterboxable) variants in place of Large letter codes where applicable. *Note these codes are only applicable to products set as parcels. As these codes do not apply to orders shipped overseas we would use MT1 tracked Large letter codes instead for the products that sit in that size band. The problem is that C&D does not allow that as a valid product combination and we are having to manually apply the postage for all international orders. The combination "large Letter /Parcel" is allowed but not the other way round. Please fix so we can auto apply the postage for all orders regardless of where in the world they are going.