Howto? Removing a branch from TeamCity build

Hello,

I have "accidentally" added a branch to a build configuration.
As an experiment I have defined a parameter which is used in my vcs checkout rules (Subversion).
After running a few build on my Trunk I tried changing the parameter value in a custom build.

This worked beautifully, I now had two branches in my build.
However, some time later, the branch is no longer wanted, and is really just complicating things unnecessarily and I want to remove it.
I cannot figure out how to remove the branch. Is this at all possible?

TYI
Thomas