[Users] lcr module

Hi, I am trying to develop some features which requires to call load_gws and next_gw in a failure route. For example, in normal routing block, it forwards the call to a subscriber's ip phone locations. If nobody answer, it tries to call a pstn number. In the failure route, i called load_gws and next_gw. However it generates an error "next_gw(): No ruri_user AVP". Looking at the code, there seems to be an assumption that first time call to next_gw always happens in the normal routing block. But in my case, it calls next_gw first time in a failure route. I even tried to manually add the new uri's username to avp i:1402. It still won't work. Is it possible to call next_gw first time in a failure route? Thanks, Richard