Not allow entering repeated references in a column - HOW?

R

ritinha

Frank,
Sorted! :) :) :) ... sth was missing (<)
The formula to be used is =COUNTIF($A$1:$A$25,A1)<=1
and NOT =COUNTIF($A$1:$A$25,A1)=1
... little things make the difference, isn´t it ;) ?
Thank you very much for your support and your time.
Ritinh
 
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