IB Limits

Does anybody know if there is a way to set a limit on the amount of shares I can trade. I remember setting limits on futures contracts, but can't remember how I did it. I accidentaly put an extra zero on a 600 shr trade this morning, ouch!
 
I see how you can set sizes, but is there any way to set a limit so that I won't be allowed to make a 6000 shr trade? Thanks
 
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