19. A system comprising: a plurality of processing systems, each processing system storing at least one application that processes invoice information, the invoice information having an application-specific data object format; and an integration server, coupled via a network, to each of the plurality of processing systems, wherein the integration server is configured to translate invoice information from an application specific data object format to a common invoice data object format, wherein the common invoice data object format comprises at least one relationship data element, wherein the relationship data element specifies at least one relationship between a plurality of entities, at least one custom data element, wherein the custom data element facilitates customization of the common invoice data object format, and a set of essential data elements, the set of essential data elements are determined based upon elements of a plurality of application-specific data object formats, and the set of essential data elements comprise an identification data element, a base data element, a pricing data element, a shipping data element, and a line item details data element, the integration server is further configured to determine the set of essential data elements by virtue of being configured to invoke a business routine, wherein the business routine is one of a standard library of business routines stored at the integration server, the business routine is configured to be invoked by a business process, the business process is used to define the common data object format, the common data object format comprises a plurality of invoice objects, and an invoice object of the plurality of invoice objects comprises a globally unique identifier, and translate the invoice information in the common invoice data object to an application-specific data object format, wherein the application-specific data object format is configured to be used by a respective application.
19. A system comprising: a plurality of processing systems, each processing system storing at least one application that processes invoice information, the invoice information having an application-specific data object format; and an integration server, coupled via a network, to each of the plurality of processing systems, wherein the integration server is configured to translate invoice information from an application specific data object format to a common invoice data object format, wherein the common invoice data object format comprises at least one relationship data element, wherein the relationship data element specifies at least one relationship between a plurality of entities, at least one custom data element, wherein the custom data element facilitates customization of the common invoice data object format, and a set of essential data elements, the set of essential data elements are determined based upon elements of a plurality of application-specific data object formats, and the set of essential data elements comprise an identification data element, a base data element, a pricing data element, a shipping data element, and a line item details data element, the integration server is further configured to determine the set of essential data elements by virtue of being configured to invoke a business routine, wherein the business routine is one of a standard library of business routines stored at the integration server, the business routine is configured to be invoked by a business process, the business process is used to define the common data object format, the common data object format comprises a plurality of invoice objects, and an invoice object of the plurality of invoice objects comprises a globally unique identifier, and translate the invoice information in the common invoice data object to an application-specific data object format, wherein the application-specific data object format is configured to be used by a respective application. 20. The system of claim 19 , wherein invoice information in the common invoice data object format is inter-exchanged between two or more processing systems.