1. A computer-implemented method for enabling an employee to request the creation of a funds management fund, the method steps performed by a processor and comprising: generating a first message by a first application, the first application executing in an environment of computer systems providing message-based services, wherein the first message comprises a request for the creation of a funds management fund and includes a first message package hierarchically organized in memory as: a funds management fund message entity; and a funds management fund package, wherein the funds management fund package includes a funds management fund entity; processing a second message received from a heterogeneous second application in response to the second application's processing of the first message according to the hierarchical organization of the first message package, the second application executing in the environment of computer systems providing message-based services, wherein the second message is a confirmation concerning the request for the creation of the funds management fund and includes a second message package hierarchically organized in memory as: a funds management fund message entity; and a log package comprising a log entity; generating a third message by the first application, wherein the third message comprises a request to change a funds management fund and includes a third message package hierarchically organized in memory as: a funds management fund message entity; and a funds management fund package, where the funds management fund package includes a funds management fund entity, and further wherein the funds management fund entity comprises at least one of a funds management area ID, an ID, a name, a description, a type code, a system administrative data, a balance carry forward indicator, an authorization group code, and a validity period; processing a fourth message received from the second application in response to the second application's processing of the third message according to the hierarchical organization of the third message package, wherein the fourth message comprises a confirmation concerning the request to change the funds management fund and includes a fourth message package hierarchically organized in memory as: a funds management fund message entity; and a log package comprising a log entity; generating a fifth message by the first application, wherein the fifth message comprises an inquiry to accounting to list all fund identifiers that satisfy the selection criteria specified by the elements of the inquiry and includes a fifth message package hierarchically organized in memory as: a funds management fund by simple selection by elements query message entity; and a selection package comprising a funds management fund simple selection by elements entity, where the funds management fund simple selection by elements entity includes a funds management area ID; processing a sixth message received from the second application in response to the second application's processing of the fifth message according to the fifth message's hierarchical organization, wherein the sixth message comprises a response concerning the inquiry to accounting to list all fund identifiers that satisfy the selection criteria specified by the elements of the inquiry and includes a sixth message package hierarchically organized in memory as: a funds management fund message entity; and a funds management fund package comprising a funds management fund entity; generating a seventh message by the first application, wherein the seventh message comprises an inquiry to accounting for a funds management fund by ID and includes a message package hierarchically organized in memory as: a funds management fund by ID query message entity; and a selection package comprising a funds management fund selection by ID entity, where the funds management fund selection by ID entity includes a funds management area ID and a funds management fund ID; and processing an eighth message received from the second application in response to the second application's processing of the seventh message according to the seventh message's hierarchical organization, wherein the eighth message comprises a response concerning the inquiry to accounting for the funds management fund by ID and includes an eighth message package hierarchically organized in memory as: a funds management fund message entity; and a funds management fund package, where the funds management fund package includes a funds management fund entity.