In the following article, it says " Collector supports these nested relationships but only 3 relationship classes deep (hydrant > inspections > violations)."
http://blogs.esri.com/esri/arcgis/2015/02/18/related-tables-exploring-new-ways-to-use-collector-for-arcgis/
but it seems it is only true on Android, but not iOS. I only have 3 levels of relationship in my case.
My iOS and Collector are all up to date.
Am I alone on this?Miaogeng Zhang