eBay

I selected some items and goes to edit quantity of multiple VARIABLE listings. Theis all listings have the price, UPC filled correctly. But when I change the quantity of these items, other feilds (Price, UPC, Item Condition) data missing and error me...

I selected few "variable" items and goes to edit item quantity in bulk. When I change them, other some details (Price, UPC etc.) goes missing on this listings. Becouse of that I cannot submit this bulk edit. what is the issue?