I would like to apply Data Validation to entries in a cell to prevent
duplicates, but I need the facility to enter a "valid duplicate" eg When
entering a surname that has been used before a warning is returned but this
can be ignored if entry is valid.

Hi,

say your area is A1 to C20. Select it go to Data Validation and enter.

=COUNTIF($A$1:$C$20,A1)=1

VBA Noob


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Use a formula of

=COUNTIF($A$2:$A$209,A2)1

where A2 is the DV cell, and on the Error Alerttab of DV, set the error
style type to Warning

--

HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

"Mald" wrote in message
...
I would like to apply Data Validation to entries in a cell to prevent
duplicates, but I need the facility to enter a "valid duplicate" eg When
entering a surname that has been used before a warning is returned but
this
can be ignored if entry is valid.

Sorry, should be = 1

--

HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

"Bob Phillips" wrote in message
...
Use a formula of

=COUNTIF($A$2:$A$209,A2)1

where A2 is the DV cell, and on the Error Alerttab of DV, set the error
style type to Warning

--

HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

"Mald" wrote in message
...
I would like to apply Data Validation to entries in a cell to prevent
duplicates, but I need the facility to enter a "valid duplicate" eg When
entering a surname that has been used before a warning is returned but
this
can be ignored if entry is valid.

Thanks Had done formula correct but not altered Error Alert tab works fine

"Bob Phillips" wrote:

Use a formula of

=COUNTIF($A$2:$A$209,A2)1

where A2 is the DV cell, and on the Error Alerttab of DV, set the error
style type to Warning

--

HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

"Mald" wrote in message
...
I would like to apply Data Validation to entries in a cell to prevent
duplicates, but I need the facility to enter a "valid duplicate" eg When
entering a surname that has been used before a warning is returned but
this
can be ignored if entry is valid.