I am currently facing the problem that labeling sources manually from a past build does not work. I always get the message that no labeling roul is defined for the checkout rule. When I let the labeling be done automatically everything works fine without having changed anything! Checking the logs I could see, that the defined labeling rule is not found correctly (branches/Rel_1=>tags) but ony trunk=>tags is found.
Am I doing something wrong or could this be a bug?