Create data validation formula so pop up box appears when a number is entered

[gatorbug]

How do I create a Data Validation formula for Column C? If a person tries to enter a number in Column C when an "X" is in a cell in Column B, would like a pop up box to open that says "Miles Not Allowed". I would prefer not having to create a VBA formula. Also, would I need two different formulas for Column C if a person enters a capital "X" or a lower case "x" in Column B?

[TABLE="class: grid, width: 50"]
<tbody>[TR]
[TD="align: center"]A[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]C[/TD]
[/TR]
[TR]
[TD]Day[/TD]
[TD]Vacation[/TD]
[TD]Miles[/TD]
[/TR]
[TR]
[TD]Mon[/TD]
[TD="align: center"]X[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Tues[/TD]
[TD="align: center"]X[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Wed[/TD]
[TD="align: center"][/TD]
[TD]200[/TD]
[/TR]
[TR]
[TD]Thurs[/TD]
[TD="align: center"][/TD]
[TD]25[/TD]
[/TR]
[TR]
[TD]Fri[/TD]
[TD="align: center"][/TD]
[TD]50[/TD]
[/TR]
</tbody>[/TABLE]

 

[Fluff]

Hi & welcome to the board.
in DV select custom & use this formula
=UPPER(B2)<>"X"

 

[Fluff]

Cross posted https://www.excelforum.com/excel-fo...ars-when-a-number-is-entered.html#post4957517

While we do not prohibit Cross-Posting on this site, we do ask that you please mention you are doing so and provide links in each of the threads pointing to the other thread (see rule 13 here along with the explanation: Forum Rules).
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[gatorbug]

Hi & welcome to the board.
in DV select custom & use this formula
=UPPER(B2)<>"X"

Thank you! This worked great.

 

[Fluff]

You're welcome