Pipelet SetShippingMethod
            Assigns the provided ShippingMethod to the provided Shipment. If no ShippingMethod is provided then any existing ShippingMethod is removed from the Shipment.
            
                Group:
                
            Basket
                Flags:
                Transaction Required
            
			Input Parameters
		
                
                    Shipment
					 : 
					LineItemGroup
							(Required)
						
                    
                
The shipment for which the shipping method is to be changed.
                
                    ShippingMethod
					 : 
					ShippingMethod
							(Optional)
						
                    
            
Shipping method for the shipment or null.