We upgraded from 10.1 to 10.3: ArcGIS Desktop, ArcGIS Server, Geodatabase on SQL Server. We still use the sdelayer 10.1 tool to register the multiple (spatial) views on the 10.3 Geodatabase, and some people still use the existing sde service 10.1 connecting to the 10.3 Geodatabase. - See more at: http://ideas.arcgis.com/ideaView?id=087E00000005A9t&returnUrl=%2Fapex%2FideaList%3Fc%3D09a300000004xET%26p%3D6%26sort%3Dtop#comments
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