My problem: After recently deploying our water UN, and having already walked through an isolation trace to make sure it works (including tracing/updating the full System tier), I went to a random area to walk through trace settings. Although 3 System valves were selected in a typical isolation trace, I discovered one valve was missed in the trace. It's not easily explainable. I've checked z-values (all valves are set to 0), made sure it's selected using a "CONNECTED" trace (which it is), and checked attributes. There is nothing that stands out as to why isolation tracing won't see this as a barrier.
I've tried these two settings for Filter Barriers, but neither makes any difference
Category Is equal to Specific Value Isolating
Asset group Is equal to Specific Value 2
(under network properties, I checked that System valve / System has "Isolating" under "Category" column)
To be clear, the yellow highlighted valve is what I've selected in the map. It's a System / System valve, not a System / Bypass valve (similar yellow in legend). It's yellow because I highlighted it. All 4 valves are identical in terms of attributes that matter for UN connectivity and tracing. There is nothing special about this one valve, it's like many others. The lines on either side show z-values of 0 as well. I cannot find anything unusual about this random little area.
It has me concerned we cannot trust the tracing results if I happened to notice this, which otherwise I would have trusted is going to produce accurate results.
