Way to set a promo so it "cannot be combined with other offers"?

[Vicky Park]

Hello guys,

I have one coupon question.
Do you guys know if there is a way to set a promo so it "cannot be 
combined with other offers?

I want to issue two coupons, and don't want user to use two coupons for 
one order.

Thank you so much for in advance.

Regards,
Vicky