1. A tangible computer readable medium including program code for providing a message-based interface for providing a range of numbers used for identification, delimited by an upper boundary and a lower boundary, the medium comprising: program code for receiving via a message-based interface derived from a common business object model, where the common business object model includes business objects having relationships that enable derivation of message-based interfaces and message packages, the message-based interface exposing at least one service as defined in a service registry and from a heterogeneous application executing in an environment of computer systems providing message-based services, a first message for providing the range of numbers used for identification, that includes a first message package derived from the common business object model and hierarchically organized in memory as: a number range request message entity; and a number range package comprising a number range entity, where the number range entity includes an interval code, a profile code, a type code, an interval lower boundary text, and an interval upper boundary text; program code for processing the first message according to the hierarchical organization of the first message package, where processing the first message includes unpacking the first message package based on the common business object model; and program code for sending a second message to the heterogeneous application responsive to the first message, where the second message includes a second message package derived from the common business object model to provide consistent semantics with the first message package.