I am having a problem with related table in collector for ArcGIS. I have a feature class with a related table defined by a relationship class of type simple, 1:1 cardinality, and forward notification. I have also activated the pop-up for both the feature class and the table in ArcGIS online. When I enter data in Collector in feature class, the related table appears and I can enter data into it too. After pressing "Done", when I try to access the related table data tapping "view", I get an error saying that the data could not be found. When I access the related table in ArcGIS online, I can see that the data I entered are stored in the table but as soon as I try to access it with pop-up, I get the same error. Can anyone tell me, what I am missing here or what I am doing wrong?
ObjectID based relationships are not supported in Collector. There is a risk of using OID based relationships and offline where a value could be duplicated and break the relationship. I would recommend using GlobalID(PK) to GUID (FK) field (Not GlobalID to GlobalID). You can also use fields like a string or integer field but there is a risk of getting duplicate field values which could introduce errors in your data set.