Does illy have an artboard limitation?

I'm designing a tradeshow display at full scale in X7. Size with crop marks is 221"w x 108"h. When I make a pdf for the third party they inform me that the file comes in at 200"w x ....

Sure enough when I open the pdf in illy it's cutting it off. I try to create a new doc in illy that's 275"w and it pops up telling me the limit is 227.54"

I can import the pdf back into coreldraw with no problems. I'm going to scale it 50% then make the pdf but....