Hi there,

I found a solution for the problem. It's not the best solution, but it's also not the worst.

seller_ids = fields.One2many('product.supplierinfo', 'product_tmpl_id')
seller_ids_2 = fields.One2many('product.supplierinfo', 'product_tmpl_id',default=lambda self: self.seller_ids,store=False)

@api.depends('seller_ids')
def _seller_change(self):
    self.seller_ids_2 = self.seller_ids

page>
    field name="seller_ids">
        tree editable="bottom">
            field name="price_list" readonly="1" />
        /tree>
    /field>
    field name="seller_ids_2">
        tree editable="bottom">
            field name="product_code" readonly="1" />
        /tree>
    /field>
/page>