This has been happing out of ORD where the gate agent refuses to print out a jumpseat card because of weight restrictions. Well let me tell ya, the W&B info comes from the load planner, who is down in ops, starring at a computer screen. The program AWAC uses is kind of sensitive and can be misunderstood. That means that just because there are 50 people booked doesn't mean they are all adults. If there is just one kid, we can usually fit a JS on. The moral of the story...Don't let the gate agent give you $hhitt. Make sure you at least get a JS card printed out and if you can't get on then so be it, but we can usually work it a bit. If all else fails, try to talk to one of the crewmembers.