ECN Forum Forums General Topics of the Trade General Discussion Area 100 AMP Sub from 150 MAIN

Is there any code against running a 100 AMP Sub Panel off of a 150 AMP Main Breaker Panel? Its a residential application the person who initially tlooked at the job mistook it for a 200 AMP Main and bid for a 100 AMP Sub. Just trying to save the checkbook to avoids eating a 200 AMP upgrade...

Any help?