Tailor multisite field relation

Hy,

I have an oc with multisite config ‘Fr, EN,AR’. And I have a tailor entry with “multisite: all” and multiple fields, one of my fields is est relation with an other entry.

When i create an entry exp: for ‘Fr’ language and then i swith to ‘En’ for the same record, all the fields are filled except the one with the relation. this is the code

handle: Cars\Models
type: entry
name: Modéles
useDrafts: false
multisite: all

structure:
    maxDepth: 1

navigation:
    mode: secondary
    parent: Cars\Cars
    icon: icon-user
    order: 200

fields:
    year_of_production:
        label: Année de production
        span: auto
        type: number
    brand:
        label: Marque
        span: auto
        type: entries
        maxItems: 1
        source: Cars\Brands
        validation: "required"
    state:
        label: État
        span: auto
        type: dropdown
        placeholder: " --- "
        validation: "required"
        options:
            new: Neuf
            used: Occasion
    motorization:
        label: Motorisation
        type: text
        span: auto
        validation: "required"

    transmission:
        label: Boîte
        span: auto
        type: dropdown
        placeholder: " --- "
        validation: "required"
        options:
            manual: Manuelle
            automatic: Automatique
    fuel_type:
        label: Type d'energie
        span: auto
        type: dropdown
        placeholder: " --- "
        validation: "required"
        options:
            petrol: Essence
            diesel: Diesel
            hybrid: Hybride
            electric: Électrique
    power:
        label: Puissance
        type: number
        span: auto
        validation: "required"

    cylinder_capacity:
        label: Cylindrée (cm3)
        type: number
        span: auto
        validation: "required"

    number_of_places:
        label: Nombre de place
        type: number
        span: auto
        validation: "required"

    exterior_color:
        label: Couleur extérieur
        type: text
        span: auto
        validation: "required"

    price:
        label: Prix
        type: number
        span: auto
        validation: "required"

    images:
        label: Images
        type: fileupload
        mode: image
        validation: "required"

    description:
        label: Description
        type: richeditor
        validation: "required"

Some one have an idea ?

Thanks