First we're using ArcGIS Server 10.3, and ArcGIS Collector for iOS.
We have a user case in which we have a number of hydrants as point preloaded in GIS. We then create a empty related table to the hydrants to be filled by the field crews onsite. We don't want to the crews to add or delete any hydrant, just click on the hydrant and insert a new record to the related table.
However here's the issue I'm having. When publishing the feature service, if I set Add/Delete feature option on, I can add/delete a new record to the related table but also can add/delete hydrant which is what I try to avoid. If set the options off, I can't add or delete a new record to the related table.
Any suggestion would be appreciated.