Hi Guys this was from Seller support - from A recent enquiry I made - hope it helps your situation.
Hello from Amazon Selling Partner Support,
I understand that you have been receiving an error message stating that " This SKU has an inconsistent product classification with the ASIN. Please submit a feed to update this SKU to match the ASIN product classification " when you try to add a new product . I will certainly assist you in this case and provide you the needful information.
Please be informed that whenever you create a listing, there will be a field called “Item Classification” in which the seller will have two options such as Variation parent and Base product.
If a seller is creating a variation listing, then seller needs to select “Variation parent” in Item Classification field.
If a seller is creating a standalone listing, then the seller needs to select “Base product” in Item Classification field.
In this case you would have created this listing as a standalone listing but you would have selected the “Variation parent” in the Item Classification field and that’s why your listing was not available in Amazon for sale.
How to make the listing Active:
Since the item classification is Incorrectly entered, the listing is not showing in the Amazon detail page. In order to make the listing active, you need to delete the listing and create a new listing again for this listing by entering the Item classification correctly which is BASE product.
Here I request you to delete the listing from your inventory and create a new listing with the Item classification as Base product and this listing will become available for sale.