The sync project needs extensive error detection, conflict detection and management. This will include both client side (incoming change error, merge strategies, user notifications) and server side (rejecting incoming change) portions.
ML Thread of interest is an epic for Revision control as outlined in the [roadmap| http://aerogear -dev . 1069024.n5.nabble.com org / aerogear-dev-Conflicts-amp-Reconciliation-td6026.html docs/planning/roadmaps/AeroGearConflictResolution/]
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