Hi, I have list range where I put data validation to prevent users from
entering wrong options. Then I put a drop-down list that is populated from a
dynamic range of a list of valid options in another worksheet (same workbook)
and set up the data validation to show an error message if an user tries to
enter a non-valid option.

The thing is... it is not working. The drop down list works fine, but I
still can enter any value and recieve no message.

What am I not considering here???