1. A non-transitory computer readable medium including program code for providing a message-based interface for exchanging information for employee master data replication requests, the program code, operable when executed by a processor associated with the medium, comprising: 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 a request to replicate fundamental employee master data, the first message derived from the common business object model and including a first message package hierarchically organized as: an employee fundamental master data replicate request message entity; and an employee fundamental master data replicate request package comprising an employee fundamental master data replicate request entity, where the employee fundamental master data replicate request entity comprises at least one fundamental data entity, where each fundamental data entity includes an employee identifier (ID), an employee leaving date, a work agreement termination dismissal indicator and an organisational centre remote object ID; and 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 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.