The revision number shown in the GUI and the one passed to an ANT-File via the
environment do not match.
Example:
We have two different svn-modules configured in hudson with automatic
build-triggering using a post-commit hook. When module A is triggered, hudson
starts a pending build with e.g. SVN revision-no 4711. During the wait period
module B is triggered with revision-no 4712. The GUI now displays revision-no
4711 for module A, but actually the HEAD is checked out and the
environment-variable SVN_REVISION is set to "4712"! Module A will still be
consistent, as the changes 4711->4712 actually happened in module B, but the
difference in the revision numbers is confusing...