According to manual:
Best-Vendor ...
Basis of calculation (norm sales price * amount sold) – (norm. sales price * amount produced)
Best-Manufacturer ...
Basis of calculation (norm. sales price * amount produced) - (norm sales price * amount sold)
So manuf = - vendor? Well, not in practice. Have top overall score several times, but never understand vendor and manuf. Is it possible for moderators to explain?
Place this thread in Bugs, because if moderators can explain vendor and manuf, then they should correct manual.