Create new food bases nutrition on total weight, in stead of per 100 gram

When trying to add a new item through the create new food option, I have scanned both front and back labels. The label mentions the food is 162 grams and that is taken as 1 serving, which is fine in itself.
The nutrition stats however, are based on per 100 gram. But the system makes it per serving in stead of per 100 grams.