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do not allow same data twice
I assume this is done through validation I just dont know how?
I have column B rows 1 to 500. I enter customer order numbers in on a daily basis, I want it to error out if I attempt to enter the same order more than once. For instance if I am on row 400 and I try typeing in order 123456 and it exists on row 286 it warns me or alerts me that it was already used? Any Ideas Would Be Great... Thanks... Sean |
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