A wireless device (208) and a method for modifying a configuration. The wireless device is operating in a wireless communications network (200). The wireless device receives a reconfiguration message comprising a difference relating to one or more parameters of a configuration, which configuration is associated with a first identity and stored in the wireless device. The wireless device modifies, based on the difference, the one or more parameters of the stored configuration, which modification results in a result configuration, and stores the result configuration with a second identity.