🔧 Castorama - Error: 1P_DUPLICATE|Duplicate of a first party product

Mirakl error message: 

"1P_DUPLICATE|Duplicate of a first party product"

What does this error mean?

This error means that the product's EAN is in the list of products already sold directly by Castorama.
As a result, the product cannot be sold by a seller via the marketplace.

How to solve this error 

To remove this error from your reports, we recommend that you exclude the products concerned from the feed.