Visa and Passport Consumption by the same user

If a user records a Visa consumption (they have used PW Explorer) and a Passport consumption (they have also used PW Web Connection) within a 90 day period, are they charged for 1 Visa and 1 Passport, or just 1 Visa? (as Visa is the more expensive licence type)

We want to give best advice of which product to use for different roles, but if a user thinks they can use the cheaper Passport for their work, and then finds an occasion where they must user PW Explorer, we want to avoid them being charged for both where possible.