Is there any way to use a cell address in the error message displayed with
data validation.

Example: cell A1=1 and A2=16, and data to be entered in cell C4 must be
equal to whatever is in A1 or A2. I can use a formula to check the value,
but when I display the error message, can I use A1 or A2 in the message, so
that it reads something like "This value must be equal to 1 or 16".

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Bill @ UAMS