odd many2many field display

Hi, I have created a many2many relationship on the model `res.partner` under the field name `x_m_role`. The related model is named `x_partner_role_model` and has one field `x_role_name`. In my partner form view I added the following xml to make the new relationship available : I have only a trouble about the display of the records in the fields. I would like the `x_role_name` field value to be display, instead I have something like `x_partner_role_model,1` How could I manage to get the value of the `x_role_name` to be displayed ? Thanks for your help Cheers