Main reason for the plus and minus numbers in COGS is inventory. Plus numbers are the cost of what was sold. Minus numbers come from stocking, increasing the qty, of an item using inventory adjust.
If you use a non inventory, service, or other charge item in an assembly, the cost on the item screen for that item is taken from the expense account listed on the item screen. If that account is COGS then the cost is taken from COGS and shows as a minus number
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