> For the complete documentation index, see [llms.txt](https://helpcenter.channable.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helpcenter.channable.com/manage-improve-product-data/manage-product-and-improve-data-fr/regles-modification-groupee-et-enrichissement/comment-utiliser-les-conditions-si-dans-les-regles/condition-de-regle-gtin-ou-ean-non-valide.md).
# Condition de règle : GTIN ou EAN non valide
### Cas d'utilisation
* Détecter et exclure les produits avec des GTIN ou EAN non valides (pour certains canaux, comme Amazon, les GTIN ou EAN sont obligatoires)
### est valide
Utilisez le **est valide** action pour vérifier que les valeurs GTIN ou EAN sont valides. Le format GTIN correct est de huit, douze, treize ou quatorze chiffres.
### n'est pas valide
Utilisez le **n'est pas valide** action pour vérifier si le format GTIN ou EAN est correct. Cette action [calcule un chiffre de contrôle](https://www.gs1.org/services/check-digit-calculator) (qui permet de s'assurer que le code-barres est correctement constitué).
{% hint style="info" %}
Dans **Installation > Modifier mapping**, assurez-vous que le champ est mappé correctement et qu'il s'agit du bon type, car ces actions ne peuvent être utilisées que pour les champs GTIN et EAN.
{% endhint %}
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