1. An article of manufacture including a non-transitory computer readable storage medium to physically store instructions, which when executed by a computer, cause the computer to: generate, at a first software solution unit, a proxy transactional context corresponding to a transactional context of the first software solution unit, wherein the proxy transactional context comprises a set of operations and identities of one or more business objects pertaining to the transactional context and the generation of the proxy transactional context creates a server session parallel to a main session processing the transactional context of the first software solution unit; retrieve business objects of a second software solution unit corresponding to the proxy transactional context; define assignment of the retrieved business objects to the one or more business objects of the proxy transactional context; and integrate the first software solution unit and the second software solution unit by executing the proxy transactional context based on the defined assignment stored in a proxy data object.