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That's what was essentially suggested to the OP in his earlier posting, but
I think OP's quite firm <g in wanting it to be also resistant to copy n paste or drag as well, both of which would defeat data validation. -- Max Singapore http://savefile.com/projects/236895 xdemechanik --- "Sloth" wrote in message ... Highlight the entire column and click Data-Validation Under "Allow" select Custom Under "Formula" enter the following =COUNTIF(A:A,A1)<=1 Replace all A's with the column selected. i.e. enter this formula for column C... =COUNTIF(C:C,C1)<=1 |
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