1. Computer apparatus for managing software configuration repositories comprising: a plurality of repositories each holding a respective set of change-request objects, the plurality including a primary repository and working repositories; and in the primary repository, a respective proxy object for each change-request object of interest in a working repository, each proxy object having a corresponding associated change-request object in the primary repository, wherein for a given proxy object, changes made to one of the respective change-request objects of interest in the working repository and the associated change-request object in the primary repository are mapped to the other.