I have a pivottable and I am trying to setup a data field that will count
unique values.

ie. Listing customers as the row and setting up a field to count the number
of sales people that sold to the customer. The base data has multiple rows
identifying the customer, sale id, $ and sales person. If I have 100 rows
with sales person A, B & C each selling multiple orders to several customers
I want the field counter to tell me if 1,2 or 3 sales people sold to each
customer.