I noticed now that when I import products using their SKUs and products have specification attributes and when I try to update it, it creates the same but new specification attributes.
Example (product already has this attribute, I want to update it, not leave old one and add new one):
AttributeType SpecificationAttribute CustomValue SpecificationAttributeOptionId AllowFiltering ShowOnProductPage DisplayOrder
Option Made in 12 True True 0
12 is USA, I want to change it to Germany (it is 27).
When I import it back it becomes like this:
Product Bla Bla
Made in USA
Made in Germany
Is there any setting for updating specifications, but now add new ones?
Thanks.