Yes agreed but if the BDC isnt sure about the users credntials (say it hasnt replicated the sam database in a while) then it will try and replciate straight, if it fails it will fall over. You are right though in theory it shouldnt but i had many instances where it has.
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If at first you don't succeed, try again. Then quit. There's no use being a damn fool about it. - W.C Fields