add notification when related WTP is only one (valid) revision in process plan and user trying to delete this WTP revision.
Nowadays any designer may create and delete revision of WTP without a notice. WTP revisions are autopropagated to related process plans. When only one existing WTP revision is deleted then WCH silently remove this WTP without a warning from process plan. It is causing crucial problems in production because process plan loosing connection with WTP.
We need to add notification when designer trying to delete WTP like "WARNING: Deleting this WTP revision will cause loosing all connections with a process plan".