My Products doesnot have product identification code. I list using ASIN. now when i attempt to add product in the Product indentity page i have ticked in drop box mentioning i have no product identity. but after i move on to further pages in variations page it is asking external product identity whereas i have none. am using ASIN so far.Once i go back to product identity page thr drop box to mention i have no product identity drop box is not displayed. please guide