Hi all,

How can I Eval cell value before allowing the user to move to the next cell.
I.E.

In A1:A6 the user enters a 5-6 Digit reference code (Mixure of
Text&Number), if one of my reserved codes is used (I.E. A1234 or A5678 or
B9999) then a warning pop-up and not allow the user to move to the next cell
on the right.

Either some solution as a formula or VBA will be fine.

Thanks

Laddie.