This is a damage assessment scenario, if two users download the same property for offline editing and does an assessment independently, then they submit their assessments respectively back to AGOL, they will end up having two assessment for one property despite the relationship between the property and the assessment table is one-to-one. it seems AGOL does not enforce the cardinality ratio when the replicas on the devices are syncing in.
Online editing or single user offline editing won't cause this issue.
Anyone else have the same issue?
Our software environment:
Collector (Classic) for ArcGIS version 19.0.2 Build 6212016
ESRI Just confirmed this is a bug for Classic Collector for ArcGIS on iOS.
BUG-000100412 : Two related records are created by Collector for ArcGIS when two users with separate devices make offline edits to the same feature, despite the one-to-one (1:1) cardinality.