We do have an issue with required fields are working on a fix and could be the reason why you are seeing the rollback message that the service is sending the app when you are trying to sync. How long after the data was downloaded and collected did you try to sync your edits?
Thanks
Russ
yes right now to have a map available for offline you need to have all layers supporting sync and/or export.
Russ
This issue has been fixed in the upcoming 10.2.3 update of the Collector app. Can you try signing out and signing back in and trying to sync those edits? We keep track of the edits in the database so signing out wont lose any of your unsynced edits.
Thanks
Russ
Here is a work around that should work;
1) in AGOL create a copy of the map that is showing the error - So just open up the map causing the issue and do Save As - MapName-Copy
2) Refresh map gallery in collector to pull down this new map
3) Open up the MapName-Copy in a connected mode
4) Exit map and go to the map with unsynced edits and tap the sync icon
This should create that username/pwd that you need for syncing the edits back.
Let me know if this works for you
Russ