Override ShipRush with Freight field

When Override ShipRush with Freight field option is enabled, the freight field in invoice will be overridden by the freight charges calculated by ShipRush.

Example:

1. Originally, this invoice has a Freight value of 0.

2.  After processing it to ShipRush, the estimated charges for this shipment calculated by ShipRush will used by VisionCore's Invoice transaction > Freight field.