mudraker wrote:
Can you post your IsValid function code


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My function is:

Function IsValid(Num As Variant) As Boolean
IsValid = (Num = 0 And Num <= 100)
End Function
(the final version will check for various text values as alternatives to
0..100, hence use of Variant)

I have no problem using the function in a formula in a cell (eg.
=IsValid(B3) in cell A3). My problem occurs when I attempt to use the same
formula for Data Validation in as cell. eg in Cell B3 I select:

Data | Validation | Settings | Allow Custom | Formula =IsValid(B3)

This ought(?) to do the same as the worksheet function:

Data | Validation | Settings | Allow Custom | Formula =AND(B3=0,
B3<=100)