Taking a closer look at the subnetwork properties, I realized that the out-of-the-box valve and meter counts in UPDM use invalid asset types. After updating the asset types to correct values, I'm getting the counts.
For MAOP, I switched the function from MIN to MAX, because services do not have MAOP populated. I found the aggregated lines property to be confusing, but I think I have it straight now. If I exclude services from aggregated lines, they don't contribute to the subnet line geometry, but they still contribute to summary attributes. However, it looks as though I can set a filter in the summary to exclude them, though I'll have to create an asset group network attribute; I'll do some more playing around with that.
