>>Hi everybody,
>>
>>What would be a better way to word the message:
>>
>>This guest can not be deleted because there is associated sales activity
>>
>>This guest can not be deleted because there are associated sales activities
>>
>>or
>>
>>is where a third better way?
>>
>>Thanks in advance.
>
>I agree with the advice to restructure the sentence, but if you stick with this, use "is."
>
>Tamar

I went with Tracy's suggestion I got in private:

Unable to delete this guest: Associated Sales activity exists.

My colleagues all liked that suggestion.