Field help (STOFCY4) 

Shipment site. It is initialized with the shipment site of the document header. The shipment site is modifiable. In the orders, this information is modifiable as long as there is no allocation on the line. Moreover it is only modifiable if partial shipment is authorized. The product reference associated with this site must exist in the product-site table if the product is managed in stock. The site must be defined with the Warehouse flag set to the value "YES".