A method of adding a program module to an installed program code. A data object having an interface for importation of data into and exportation of data out of the data object, the data object further comprising the program module, a switch identifier and a specification of a call to be inserted into the installed code is provided. Insert the call as specified by the specification of the data object into the installed program code and receive a setting for the switch from a user and storing the setting in a database table.