If there's no restrictions (such as once per month) and you haven't reached the monthly limit (of $600 or $1,000), you can have multiple dines at the same location!

Important note: Vary your amounts to different mile/point amounts! (Allow one "dine" to give you 102 miles and one "dine" to give you 104 miles!) The reason is that the idine computer is programmed to notice 2 "dines" from the same restaurant on the same day for the same amount! You will (eventually) get credit, but you may have to send in your receipts to prove that they were different "dines" and not just that the server ran your card twice because "the machine didn't work".

What I do is if my bill is $51, I ask the server to run 2 charges - one for $25 and one for $26! Thus, I get 2 dines!