i have a many2one field. It is in a line(part of tree for one2many.)

<tree string="PLD" editable="bottom">                               

<field name="priority_set" />                         

<field name="shop_id"  domain="[('is_shop', '=', True),('usage','=','internal')]"    options="{'no_open':True,'no_create':1,'no_create_edit':1}" />          //shop_id = fields.many2one('stock.location')                     

<field name="temp_id"      options="{'no_open':True,'no_create':1,'no_create_edit':1}" />                           

</tree>

i want to select a shop for 1st line. In the 2nd line, the selected shop value should not be shown in the many2one dropdown. How can it be done?