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 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 a business object of a second software solution unit corresponding to the proxy transactional context; define assignment of the retrieved business object to a business object of the first software solution unit using the proxy transactional context; and store the defined assignment in a proxy data object to integrate the first software solution unit and the second software solution unit.