A system includes reception of an instruction to determine configuration properties of an instance of a first business object, determination of a first type of the instance of the first business object, determination of whether or not the first type is extendable. In a case it is determined that the first type is extendable, a second reference object is determined, the second reference object conforming to the first type, an instance of the second reference object is determined, configuration properties of the instance of the second reference object are determined, and, in response to the instruction, at least the configuration properties of the instance of the second reference object are returned as the configuration properties of the first instance of the first business object.