I think the once you put in the referral for a customer, it should stay there unless we wanted to change it. I find it hard to trace who the referral was when they come back at a later stage.
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I agree, this would be an immemsely useful feature for tracking income generated from different advertising streams. It makes no sense to have it only as an option to add when entering a sale, as the referral source of a client is never going to change. We've been setting up dummy employess, so we can use the Salesperson option on the cards, which automatically come up on the sales, but with STP this is becoming a bit of a problem.