I think what @BawarYassin means is that if 3 items of 250g are sold in one line and 7 items of 300g are sold in the next line, the total weight of 2850g wouldn’t appear because Manager doesn’t do an extra multiplication calculation.
Item | Weight | Qty | Tot Wgt | Price | Total
Coffee A | 250 | 3 | 750 | 100 | 300
Coffee B | 300 | 7 | 2100 | 150 | 1050
__________________________________________________
Totals | | | 2850 | | 1350
What probably needs to happen to get the correct total weight is for line 1 to say 750g and line 2 to say 2100g and then one’s pricing per item needs to be adjusted to a price per g.
Item | Qty | Price | Total
Coffee A | 750 | 0.40 | 300
Coffee B | 2100 | 0.50 | 1050
_______________________________
Totals | 2850 | | 1350
Not sure if that can be done via a custom field…