Route determination is done based on the target country and transportation zone along with the shipping point. If you have the same shipping points for two deliveries to the same country and same transportation zone, then the same route determination is applied to both.
While creating a delivery document, its route is determined based on the shipping party and ship to party information.
Go to: SPRO → IMG → Logistics Execution → Transportation → Basic Transportation Function → Routes → Define Routes → Define modes of transport → Execute.
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