If you're trying to redistribute iBGP into an IGP, you must configure bgp redistribute-internal under BGP to allow this.... We don't allow iBGP learned routes to be redistributed into an IGP by default, because it's a fairly dangerous practice.
If they're eBGP learned routes, can you give us a little more information, such as the redistibution configuration you're using?
:-)
Russ.W