Are you thinking perhaps that say I have something - eg cheese on toast - where I'll have a shake of Daddies sauce on it - well I don't count that, cos a teaspoon of brown or red sauce doesn't make any difference really, so I don't allow for it?
Well it's a bit different when a whole pint of sauce is incorporated in the finished dish!
The clue every time is - how MUCH of it is in there?