An application and system are provided that prevent an application repository from accepting a new installation package if the new application installation package would not be successfully installed on devices to which it is directed. The version number and constraints provided with the new application installation package may be compared to that of installation packages already existing or published within the repository to determine whether or not the new installation package will be unreachable by a device group to which it is directed. An indication may be provided if that new installation package is unreachable by at least one device group to which it is directed.