I have two branches, let's call them mainline and dev1. I regularly integrate a file from mainline to dev1. The last-but-one time I integrated the file, it was at revision 3 in mainline. The last time, it was at revision 5. Now for mysterious reasons lost to the sands of time, I want to work in dev1 with revision 4 of the file from mainline. Is that possible? I can't integrate it across as P4V complains that all revisions have already been integrated. I've tried right-click-get this revision on the revision graph, but that only updates which version of the file I have in mainline, not in dev1.