Hi, I have a simple spreadsheet which I need help with. I need to prevent a
customer from using more then one computer (C*) and or laptop. What I need
is a way of stopping more then one yes per row. I have validated the cells
with a list of Yes/No, but cannot find a way of stopping the Yes being
entered if a yes has been entered in a different cell on the same row?

Own Laptop C1 C2 C3 C4 C5
Customer 1 Yes
Customer 2 Yes
Customer 3 Yes
Customer 4 Yes
Customer 5
Customer 6 Yes
Customer 7
Customer 8 Yes
Customer 9 Yes
Customer 10

Any help with be appreciated.

On Jan 11, 1:32*pm, scubas wrote:
Hi, I have a simple spreadsheet which I need help with. *I need to prevent a
customer from using more then one computer (C*) and or laptop. *What I need
is a way of stopping more then one yes per row. *I have validated the cells
with a list of Yes/No, but cannot find a way of stopping the Yes being
entered if a yes has been entered in a different cell on the same row?

* * * * Own Laptop * * *C1 * * *C2 * * *C3 * * *C4 * * *C5
Customer 1 * * * * * * *Yes * * * * * * * * * * * * * *
Customer 2 * * * * * * * * * * *Yes * * * * * * * * * *
Customer 3 * * *Yes * * * * * * * * * * * * * * * * * *
Customer 4 * * * * * * * * * * * * * * *Yes * * * * * *
Customer 5 * * * * * * * * * * * * * * * * * * * * * * *
Customer 6 * * *Yes * * * * * * * * * * * * * * * * * *
Customer 7 * * * * * * * * * * * * * * * * * * * * * * *
Customer 8 * * * * * * * * * * * * * * * * * * *Yes * *
Customer 9 * * *Yes * * * * * * * * * * * * * * * * * *
Customer 10 * * * * * * * * * * * * * * * * * * * * * *

Any help with be appreciated.

Select B2:F11 (adjust to real table)
Apply custom Conditional formatting with this formula:

=COUNTIF($B2:$F2,"Yes")<=1

Regards,
Stefi