This is a SQL Server GeoDatabase. I have created a couple of tables using SSMS; then imported data to them. Then, inside ArcMAP, I created Layers and pointed their data to these tables via SDE. So now I have an MXD with Feature Classes.Then I defined Relationships between the Feature Classes.
So far so good. What I now need is to enable Attachments on a couple of these Feature Classes. I suppose I can't do that until I Register these Feature Classes into the GeoDatabase using ArcCatalog because the Enable Attachment option is not available?
Assuming that was the problem, I tried to do the 'Register with GeoDatabase' from ArcCatalog but am getting an error: 'Invalid Entity Type'? I have Googled but can't find anything which would help me. This is just a local test environment but I need to learn enough from it to implement an enterprise wide setup.