Shipment transaction includes loading transactions approved in the shipment slip on the relevant transport vehicle and deliver to the customer. As a result of this operation, the status of the shipment slip changes as "Under Way". The shipment transaction is performed over the shipment slips in Approved status by using the Start Shipment menu option. As an exception to the slips in Approved status, Start Shipment option becomes active in F9 - right click menu for the Draft slips as well provided that System Settings > Defaults and Parameters > Sales Management Parameter > Other Transactions > Shipment Transactions in Draft Status Will Affect Reservations parameter is set to Yes.
After specifying the Actual Output Date in Start Shipment window, the "Transfer" option is clicked. Once the shipment starts, the "Reserved for Distribution" quantity decreases while the "In Distribution" quantity increases.