scm:branch ignores the tagBase parameter, there is no branchBase parameter

[DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-scm-plugin:1.9.4:branch' with basic configurator -->
[DEBUG]   (f) basedir = /home/acme/gotham/common_ui
[DEBUG]   (f) branch = 2.2/2.2.0
[DEBUG]   (f) connectionType = connection
[DEBUG]   (s) connectionUrl = scm:svn:svn+ssh://svn@svn.acme.com/repos/trunk/common_ui
[DEBUG]   (f) developerConnectionUrl = scm:svn:svn+ssh://svn@svn.acme.com/repos/trunk/common_ui
[DEBUG]   (f) pushChanges = true
[DEBUG]   (f) remoteBranching = false
[DEBUG]   (f) settings = org.apache.maven.execution.SettingsAdapter@7b300cde
[DEBUG]   (f) tagBase = svn+ssh://svn@svn.acme.com/repos/branches/common_ui
[DEBUG] -- end configuration --
[INFO] Final Branch Name: '2.2/2.2.0'
[INFO] Executing: /bin/sh -c cd /home/acme/gotham/common_ui && svn --non-interactive copy --file /tmp/maven-scm-1267210601.commit . svn+ssh://svn@svn.acme.com/repos/branches/2.2/2.2.0

            if ( !StringUtils.isEmpty( tagBase ) && repository.getProvider().equals( "svn" ) )
            {
                SvnScmProviderRepository svnRepo = (SvnScmProviderRepository) repository.getProviderRepository();
                svnRepo.setTagBase( tagBase );
            }