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In ArcMap 10.4 and previous versions, when opening the related table of an attribute table in a Survey123 feature service with repeats published to ArcGIS Online, the following error is returned:
Error: Could not load data from the data source. If you can correct the problem, press the refresh button to reload the data. Possible problems can include bad network connection, invalid field, etc. A general error when something is wrong with a Field.
This error occurs because each repeat is created as a table with relationship classes using the globally unique identifier (GUID) data type. ArcMap is unable to open a feature service with the GUID data type from ArcGIS Online. This is a known limitation. For more information, refer to BUG-000091817.
Apply one of the following options to resolve the issue: