That's going to be tuff to do because of the input order being random. I
assume an entry of 10.5 in one cell and 10.5 in the other is OK since the
total is an interger? The "easy" way would be to use a formula in the sum
cell that pops a message if the sum is not a whole number and tells the user
to "adjust" the inputs:

Assume the input cells are A1 and A2.

=IF(COUNT(A1:A2)<2,"",IF(MOD(SUM(A1:A2),1)0,"Inva lid Sum, Re-enter
data",SUM(A1:A2)))

Biff

"BorisS" wrote in message
...
I have two cells that add up to a third. I need to validate or do
something,
which limits the first two cells' inputs, to where the sum of the two does
not equal a decimal. The order in which the two cells will be input is
not
certain, and so the "validation" must be on both input cells.

So what I need is what to apply, and to what cells. I'd like to avoid VB
if
possible, so am hoping there's a way to do this with validation.

Thx.
--
Boris