Validation of Data Formula in Excel

EE Pros,

I'm trying to place "validation" on a particular cell that looks at a "merged" cell and if there is content (e.g. a number) then it issues a Warning.  I know how to use Data Validation and thought this was the easiest way.....however, I don't know the formula.

I've tried =if(G4<>" ") and (G4<>"") but neither work.

Here is a diagram/sample.

B.
Validation-Warning.xlsm
Bright01Asked:
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Excel amusantCommented:
Select cell (E8) Enter this formula in data validation.


=istext(G4)

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Validation-Warning.xlsm

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Bright01Author Commented:
Perfect!  Quick and effective.  Thank you!

B.
Excel amusantCommented:
You welcome, glad it was helpful.
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