Data Validation
Dears,
I'm new to this forum, and I have query
I have a request from client (long entery sheet) , one of the columns its the first one in the sheet a cliam number , the condition is to allow the user to duplicate the value only once , I tried to use this formula in the data validation custom bar
=COUNTIF($A$2:$A$2922,A2)=2 , but this doesnt allow to enter any value, im out of solutions , please help me guys
a spreadsheet atached often helps
=COUNTIF($A$2:$A$2922,A2)=1
Wayne
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