I have added several items to my store. In each item I may have 2 or 3 sizes/colors available. I very carefully fill in the SKU's and UPS's for each under the "Edit Variables" field. Even after saving, if I open that page again to revise or whatever the SKUs/UPCs are gone. Now, I can't see these listed in the spreadsheet when I download it. All I see is the "parent". I don't see SKUs or UPCs on the invoices when I sell. How can I be sure that these feilds are working properly if the very act of checking them deletes them? Am I doing something wrong?