Utility Network is allowing mainline split without a device - "Validate" should give an error

[SusanONeill1]

I am using a simplified Sewer Utility Network very similar to the "Essential" model in the new ESRI Sewer download.  I have an Edge-Junction-Edge rules that a Control Valve can connect 2 Gravity Mains.  If I place a Control Valve without splitting the line, Validation gives an error, which is the behavior I want.  But if I split a mainline without placing any Device at the split - and run the UN Validation, it does not give an error.  I tried using a "New Unnecessary Nodes" Constraint Attribute Rule, since the 2 resulting features will have the same attributes except for Calculated Length, but Validate still said it was fine.  So far I haven't used "Terminal Configurations" in my UN.  Do I need to use those in order to enforce a rule that you can't just split a mainline in the middle? Thanks for any assistance.  

[JoaquinMadrid1]

Why would you expect from OOTB behavior that splitting a line should be flagged as an error after running Validate Topology? (I just do not know what your use case requires.)

[SusanONeill1]

The only reason to split a mainline would be to place a manhole or valve there.  Rather than rely on the editor to follow through with that, I would like it to identify that just splitting a mainline and leaving it like that is not valid.  Under the geometric network, it automatically generated a "Network Junction" to indicate the loss of connectivity.  I'm looking for something similar here.  Thanks.

[SusanONeill1]

Based on other posts, it sounds like this is the expected behavior for the Utility Network since the Asset Group and Asset Type of the 2 lines are the same.  A "System Junction" is created at the intersection.  So I need to figure out another way to enforce the behavior I want - it's not built into the UN.  I'm not very familiar with Arcade, but there may be a way to create a Constraint Rule to do the same function.  I've tried a few of the "Ready to Use Rules" but without success.  

[SusanONeill1 · Accepted solution]

    I finally found what I needed here:  https://community.esri.com/t5/arcgis-utility-network-questions/finding-system-junctions/td-p/1351529

It allows you to view the system junctions.