1. A method, in a pedigree data processing system, for generating electronic pedigrees, the method comprising: generating a receive native event for a first item received from an upstream partner; receiving pedigree data for the first item from the upstream partner; generating at least one synthetic event based on the pedigree data; storing, by the pedigree data processing system, pre receive native event and the at least one synthetic event in a pedigree data repository; determining, by the pedigree data processing system, whether to send electronic pedigree information for the first item to downstream partners using push data exchange or pull data exchange; responsive to determining to send electronic pedigree information for the first Item using a pull data exchange, generating, by the pedigree data processing system, an electronic pedigree for the first item using pull data exchange based on the receive native event and the at least one synthetic event; and providing, by the pedigree data processing system, the electronic pedigree to a first downstream partner pedigree system.