For the reason the node id is used by generating the alarm reduction keys, Business Services get empty in case of reprovisioning nodes. The internal nodeid changes and all definitions get empty without any indication. The Business Services and probably dependencies stay in the system. Before reprovisioning nodes there should be a warning which business services will be affected if requisition is reprovisioned. Otherwise using more foreignids instead of nodeids to prevent this problem, but has more impact on the alarm handling in general.