Issues with setting zone points

[Neiv]

Is there some limitation for setting new zone points--or adjusting existing ones--in certain zones? I am trying to set a new zone point in West Commons (using the zone_points table) and it is not recognizing it no matter what I do. I have set a zone point from a custom zone into West Commons, and it works fine; but I can't get the converse to work (WC to the custom zone). Just for some background, I have successfully worked this same plan between West Karana (qey2hh1) and the same custom zone (though at a different zin and zout in that zone). But for some reason, it's not working in West Commons. Any thoughts?