Updating revision number on a branch.

[Heather]

We are doing parallel development with 2 different versions of our
code.  We have version 2 on a branch and version 3 is on our main
trunk.  What we want to do is update the revision numbers on the
version 2 branch to be 2.xx and the revision numbers on the version 3
trunk to be 3.xx.

I tried to do a cvs commit -r 2.0 on our branch, but it seemed to be
looking at the last version in the repository rather than the branch
version to do the commit because it said the file failed the up-to-date
check.  This particular file has been updated in version 3 but not in
version 2, so it IS up to date on the version 2 branch.

Is this possible? (I looked in the faq/manual & googled but couldn't
find an answer to this problem)
Any help is greatly appreciated.

Thanks,

Heather W.