In data validation I use formula (example)
= COUNT(FIND(List;A1))=0 or
= COUNT(FIND(B1:B9;A1))=0
to prevent the entry of special characters or space specified in the list (B1:B9). All cells are formatted as text
I set the formula in Data Validation, stretch it to about A:10, save it and everything works. Reports errors for all characters typed in A1:A10 listed in B1:B9
Then I turn off excel, turn it on again and the formula recognizes only the character in B1 and reports an error for it. For the others (B2:B9) after starting and turning off excel formula doesn't work.
What i did wrong?
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