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...cost to be defined when setting up a new inventory item...
I strongly second that, especially when creating an item from a Sales invoice. Then the first negative quantity transaction would also generate a negative value on hand, and record COGS.…
The customer sales detail report will show deleted or adjusted transactions, and probably doesn't show and 'variance' amounts. Those show only on the inventory report.
To really 'fix' this you have to:
1. Reverse the sales invoice
2. Record the…