In a first general aspect, a computer program product tangibly embodied in an information carrier is described. The computer program product includes instructions that, when executed, perform operations for identifying a source or destination for stock. The operations include receiving an electronic request to determine a source or destination for stock, identifying, using a primary rule, a logistic area database object that represents a storage location at one of multiple levels of a hierarchy of storage locations. The logistic area database object is associated with a value that indicates an amount of stock that is associated with the storage location. The operations also include transmitting an identifier specifying the logistic area database object if the value indicates that associated storage location is available as a source or destination. The identifier is used to assign the storage location as the source or destination for the stock.