HOW DO I GET A WARNING FOR REPEATED NUMBERS

Kenya · Apr 4, 2005

I am working on a spreasheet in excel I have got invoice numbers but i need
to create a warning for repeated invoice numbers.Any help would be most
appreciated.
Thanks

Kassie · Apr 4, 2005

Try =COUNTIF(A:A,A1)=1, previously posted by Vishu

Kenya · Apr 4, 2005

Thank you Kassie,It worked!

Kassie said:
Try =COUNTIF(A:A,A1)=1, previously posted by Vishu

Kenya · Apr 4, 2005

For those who are not as computer literate. Here follows instructions:Click
on A to high light that column. Go to Data. Go to validation.In settings go
to Allow and put in Custom.In formula put the formula =COUNTIF(A:A,A1)=1.
Follow this procedure with column B or C ect and substitute A for B or C ect
in formula box.

Kassie · Apr 5, 2005

Glad I could help. thanks for the response

Kenya said:
Thank you Kassie,It worked!