git-svn branch naming question

hi,

i'm using git-svn for projects where i don't just want to commit to
trunk but to other branches, too.

for example:

git-svn clone -s svn+ssh://vmiklos@svn.gnome.org/svn/ooo-build ooo-build

then i have a local 'master' branch and all the other branches are local
branches.

so, when i want to work in the ooo-build-2-3 branch, i do a:

git checkout -b ooo-build-2-3 ooo-build-2-3

but when i do a git svn rebase, i get:

warning: refname 'ooo-build-2-3' is ambiguous.

what am i doing wrong?

in fact i suspect that in case i would use some other branch name, like
simply '2-3' then i could get rid of this warning, but that's the
problem with using the equivalent name of the remote branch when working
in a branch locally?

probably i miss some parameter to git-svn clone so that it would prefix
the refs with some 'origin'?

thanks,
- VMiklos