I created a custom spatial reference at spatialreference.org ( http://spatialreference.org/ref/sr-org/8391/ ) and defined it in PostGIS using the INSERT statement generated by this site. I created my tables with geometry type using this custom SRID ( st_setsrid(geom,98391) ). These tables works fine when accessed through QGIS, but when I try to load at ArcMap with a Database Connection, I receive the message "Could not add the specified object to the map. The coordinate system identifier is invalid". Ok, I invented this identifier. But, how can I tell this to ArcGIS?
I tried this connection using different ArcGIS versions (10.2, 10.4) and database instances. The message is the same. So, it´s an old issue.
P.S.: I don´t have a geodatabase configured, and don´t want it.