Two coupon codes error is messed up

[mltsy]

ShopSite says you can only use one coupon code at once, which is fine but when you put in two codes it should at least give a valid error message of some kind rather than freaking out. Right now it displays a huge dollar amount for the previous coupon and says only one coupon allowed, then on the next reload of the cart, the previous coupon is gone - even if you decided to remove your new one - so they are both gone... there is definitely a better way to react to this case

[Jim]

And your suggested response is ....?