Somthing like the below. Right click sheet tab>View Code and paste the below
code..A1:C1 is the range you enter the values...and D1 is the cell with
formula. Adjust to suit..
Private Sub Worksheet_Change(ByVal Target As Range)
Application.EnableEvents = False
If Not Application.Intersect(Target, Range("A1:C1")) Is Nothing Then
If Range("D1") < 100 Then
MsgBox "Total of A1:C1 should be more than 100"
Target.Value = 0: Target.Activate
End If
End If
Application.EnableEvents = True
End Sub
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If this post helps click Yes
---------------
Jacob Skaria
"Stuart M" wrote:
> Cell validation only works when data is entered directly in a cell. I want to
> recreate this effect so that Excel displays a pop up message when the
> calculated value of a cell falls below £100. The cell in question is
> calculating the sum of three other cells on the worksheet and is formatted as
> currency.
>
> Cheers