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If you receive message as “Error Inserting Feature (class: table_name, id:000 ) XX000: Polygon must have at least four points in each ring” while trying to post a feature. This error can occur if there are multiple geometry columns in current spatial table.
OpenCities Map supports a Simple Geometry feature, which is table with one geometry column.
Reference: https://docs.bentley.com/LiveContent/web/OpenCities%20Map%20Help-v14/en/GUID-AE5C01B1-8D20-C9CA-D505-503BB7BB8A7F.html