1. nopCommerce version
2. Expected behavior
When imported products from Excel with duplicated SKUs it should not import the same item multiple times
3. Actual behavior
I have Excel file with products (from my supplier) with some multiple rows for the same SKU. (From 2000 items I have 65 duplicates.) Each row has a different category which should go this item under. (It is because one item fits under multiple categories.) When I import the file instead of either showing an error or importing those items with multiple categories the system imports the same SKU more than one time. This generates an error when looking at the SKU in Products
4. Steps to reproduce the problem
Create Excel with 2 rows with the same SKU and import it.
5. Any private modifications you made to your nopCommerce