RWMS: Prevent whole carton going to outbound door

Hello All,

I have a PO for an item with 100 units. I am receiving all 100 in one carton. I have a PREDIST stock order on this PO and all 100 units are allocated to just one store.

Created an appointment and printed the receiving label. Container's dest ID is populated with the store ID, to_location, final_location are populated with the outbound door which are fine.

Unit pick system code of the item on a PO is some third party sorter's code and I would like to route the carton always to the third party sorters. This is happening if the allocated qty is less than the carton but not happening for the whole carton allocated to a store.