Hi JosephE , I don't see any build transactions, so I can't see a full movement history?
For any of the invoices showing zero cogs on this display, if you edit the invoice, add a fullstop to the journal memo, click OK (to repost the invoice), then run this report again, do the values change?
Can you run an item sales detail report for this product, and customise it to remove the Status and Promised Date fields, and add in the Gross margin dollar and percent. Do the sales showing nil COGS on this register report correctly or not? (Don't post the result, too sensitive).