25. A distributed system operating in a landscape of computer systems providing message-based services defined in a service registry, the system comprising: a graphical user interface embodied by computer readable instructions executable by at least one processor, for querying supply part shortage information associated with a service part supply plan, using a request; a first memory storing a user interface controller for processing the request and involving a message including a message package derived from a common business object model, where the common business object model includes business objects having relationships that enable derivation of message-based service interfaces and message packages, the message package hierarchically organized as: a service part supply plan supply chain management shortage overview by elements query message entity; and at a first hierarchical level of the first message package, a selection package, where the selection package includes, at a second hierarchical level within the first message package, a service part supply plan supply chain management shortage overview by elements entity, and where the service part supply plan supply chain management shortage overview by elements entity includes, at a third hierarchical level within the first message package, a selection by actual result indicator and at least one of a selection by demand planner group code, a selection by service part planning product group code, a selection by ship from location internal identifier (ID), and a selection by ship to location internal ID; and a second memory, remote from the graphical user interface, storing a plurality of message-based service interfaces derived from the common business object model to provide consistent semantics with messages derived from the common business object model, where one of the message-based service interfaces is operable to process the message via the service interface, where processing the message includes unpacking the first message package based on the common business object model.
27. The distributed system of claim 25 , wherein the first memory is remote from the second memory.