Escape field entry

[torpid]

Hi, I am attempting to build some code to ignore the last input into a table field. In full, I have people swiping cards to sign in and when the database notices that they have signed in, the second swipe updates their data to 'timeout' and ignores the second swipe. I have all the code for the rest of it, but I need to find some way of ignoring the second swipe. I have the idea that if I use KeyPress(ESC) it will just escape the input and all is well. I don't know how to implement this or if it's the best practice. Any ideas?
Any help is appreciated.

[RuralGuy]

Me.YourControlName.UnDo will reverse any edit of that control. Using YourControlName of course.

[torpid]

Thanks RG, once again.
I found this on a forum about 5 minutes ago:
DoCmd.GoToRecord , , acLast
DoCmd.RunCommand acCmdDeleteRecord

Which did pretty much the same thing, but a little less efficiently, just for anyone reading over this.

Thanks champ

[RuralGuy]

Fixing the problem is the main issue. Thanks for posting back with your success and solution.