i can't insert data into Pivot table by laravel nova

salam-alaikum

I am working on the project by laravel nova and I can't insert data into Pivot table.

let me describe what my problem is.

I have 4 tables.

1- product

• id
• title
• content

2- attributes

• id
• name

3- attribute_values

• id
• name
• attribute_id

4 - product_attribute_values - ( Pivot table )

• product_id
• attribute_id
• attribute_values_id

After that, I make Resource (AttributeValues) by Nova to insert the value of attribute into (attribute_values) and the same Resource I insert data into product_attribute_values - ( Pivot table ). Actually, I can insert product_id and attribute_values_id into product_attribute_values but I can't insert attribute_id

this is my Resource.

public function fields(NovaRequest $request) {

    return [

        ID::make()->sortable(),

        Text::make('name')->showWhenPeeking()
            ->sortable()
            ->rules('required', 'max:255'),

        Text::make('description')
            ->sortable()
            ->rules('required', 'max:5000'),

        BelongsTo::make('Attribute'),

        Multiselect::make('Product','ProductAttributeValue')
            ->options(\App\Models\Product::pluck('title', 'id'))
            ->belongsToMany(\App\Nova\Product::class),

    ];
}