Code for a new development effort was imported into a developer’s branch.

Now we want merge his changes to trunk (which is currently empty).

I tried the merge from both the command line and the Tortoise GUI and keep running into the “…must be ancestrally related…” message.I also tried the "ignore ancestry" option via the GUI.

One, I don't understand why SVN thinks there is even an ancestral relationship betweeen the two locations?

Two, how can I do to get around this error message?