I am supprised that no one has explained this in normal terms to you so far. Here goes. Under normal operation (in your case) BGP will not advertise a network unless it learns it from an IGP first (in BGP's case it will consider a static route an IGP route). You can make BGP advertise a network not learned by an IGP but this is only sugested to be done when all internal routers are running IBGP. Then you would use the no-synchronization command to allow BGP to advertise these networks. THe other alternative is to set a static route pointing to null0 (ip route 192.168.1.0 255.255.255.0 null0) and have BGP advertise that network to its EBGP neighbor. OR run an IGP like RIP. That is why it works when you add rip routing. Hope this helps.
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