FeedFixer

Amazon error 8542: Your data conflicts with several ASINs

What does it mean?

Like 8541, but the product ID maps to two or more ASINs and none of them matches your data.

How to fix it

As with 8541: align your data, list by ASIN, or correct the GTIN; otherwise Seller Support.

Where do you fix it?

More on this subject

Source

Summarised in our own words; Amazon's page is leading.