Hi
I have data in column A, B and C (these are account numbers). I need to
prevent
a) duplicate entries - which is working fine with "COUNTIF($A:$C,A2)<2"
formula in custom data validation

I also need to add two more validations
b) only numbers are allowed (no letters or characters)
c) the lenght must be 8

Can some one help me with a formula for all 3 of them or is there a better
way of doing this in VBA (instead of data validation)

Thanks