I'm using the Skyline Generic Source connector to set up sources.
I want to link each source to an edge device by making use of DCF. But how do I know which DCF interface is linked to which source?
That protocol contains no DCF implementation, the interfaces that you see are then ones from the resources.
Each Resource (DVE) will have it's table filled with its own Interfaces.
Again, that will be the case for all protocols that export resources (that contain interfaces), nothing special for this protocol.
If you are talking about dynamically created interfaces based on a table, then I believe this is not directly visible in the UI. Typically some identifier is used in the name of the generated interface.
You are able to see this link when using GQI though. This is available in the 'Interface parameter index'. Do note that this data source is still behind the 'Generic interface' soft launch option.