Warehouse calling trucks from the parking area in SI General Discussions Posted August 27, 2014 One way is to manipulate the Entity Destination on the Output@ParkArea. Create a node list of Input@Warehouse. Set the Output@ParkingArea to Entity Destination Type:Select From List, Node List: NodeListName , and Blocked Destination Rule: Select Available Only. Set the Warehouse Initial capacity:3 and Input Buffer:0. Change Output Buffer at ParkArea back to Infinity and remove the add-on processes.