Can't delete a remote subscription

Long time ago I created a remote subscription to a SQL Server box to read it's logs. That server is long gone and I can't seem to find the correct way to remove the Remote Source from Hana.

Of course I've tried right clicking -> delete. And executing "drop remote source <source_name> cascade".

In both cases I get the following error:

Could not execute 'drop remote source <source_name> cascade' in 3:09.659 minutes .

SAP DBTech JDBC: [256]: sql processing error: DROP: HanaPOC::Countries_RS: stopSubscription failed for remote subscription HanaPOC::Countries_RS. exception 151053: CDC stop subscription failed: exception 151040: No agent was found for adapter "<source_name>".

Surely the remote source does not still need to be there in order to drop it, right?

Any ideas?

Thanks,

Tim