We've already got a rule set up to assign PO Box, Parcel Collect, Parcel Locker, etc to Australia Post as they are the only carrier that can deliver to these addresses (and Startrack in some circumstances). Problem is when the person packing the order confirms/updates the weight I'm finding they are then seeing there's a cheaper option by another carrier and assigning it such. This has happened to us twice this week and the parcel has had to be returned and reshipped. Our previous system would prevent them from printing the label in such a circumstance. A warning would be sufficient as there could be a circumstance where it needs to be overridden (e.g. Startrack).
