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# EAN: Unknown reference. You must create your product before submitting an offer

In the offer integration log / report, you often see many identical errors:

> EAN : Référence inconnue. Vous devez créer votre produit avant de mettre une offre, ou mettre une offre sur un produit déjà existant en utilisant l'EAN

*(Message from Cdiscount / Octopia in the offer report — often in French.)*

Two cases:

### 1. First offer feed

Your products do not exist yet on Cdiscount (EAN unknown in the catalog). Check whether you need to send products first:

[Is it necessary to send my products?](https://doc.common-services.com/en/article/is-it-necessary-to-send-my-products-1um2501/)

Then follow product creation:

[Export : Products creation](https://doc.common-services.com/en/article/export-products-creation-10lmyhm/)

### 2. Offers already exist for these EANs

Offers were already online, created outside the module (Cdiscount / Octopia back office, or another integrator).

Make sure your PrestaShop **references** match the Cdiscount **SKU / SellerProductId**:

[Validate your catalog structure](https://doc.common-services.com/en/article/validate-your-catalog-structure-cdiscount-1trq16m/)

If the marketplace SKU is an **ID** (method used by some integrators) rather than the PrestaShop reference, contact [support](https://doc.common-services.com/en/article/support-cdiscount-3q3l4m/).

If offers were entered manually and SKUs do not match, have offers **purged / realigned** on Cdiscount / Octopia, then resend a **Full Package** offer feed.