In the SEO tab of a product, you can see the rich snippet preview of it but there is no settings. Google reports me that our website is missing "sku" information of products. Means Google successfully scans the site for products but only one field is missing.
I went to Export -> Products and from field matching I created "sku" entry. But it doesn't fix. What can I do now?
Is what you call as "product code", the "code" field under "Price / Inventory" section when editing a product? If yes; then I can confirm that it is not the issue. Because those "code"s are all filled already.
Plus; how would CS-cart know which fields I am using for GTIN, MPN etc?
Edit: Yes, that code field you told pairs with sku field in rich snippets. I didn't notice at first because I had half of the products not having the code filled.