openerp - Populating dropdown list according to product id in Odoo -


i have created tab in product form manufacturer. has manufacturer_name , manufacturer_partno fields , others. each product has multiple manufacturers (one many relationship). want dropdown of manufacturer_partno in add supplier form of same product (same product id). want know how possible. please me out if can. 

    // product class extension     class product_template(osv.osv):     _inherit = "product.template"     _columns = {         'mrpproduct_partnumber': fields.char("part number", size=30, required=true),         'mrpproduct_description': fields.text("description", required=true),         'mrpmanufacturers_ids': fields.one2many('mrpproduct.manufacturer','mrpproduct_id',string="manufacturers"),         'mrprohs_compliant': fields.boolean('rohs compliant'),         'mrprequires_inspection': fields.boolean('requires inspection'),         'mrpperishable': fields.boolean('perishable'),         'mrpperishabledate': fields.date('perishable date'),         'mrpwashable': fields.boolean('washable'),         'mrphazardous': fields.boolean('hazardous material'),         'mrphazardouspdf': fields.binary('msdf pdf'),         'mrpmsllevel_id': fields.many2one('mrp.msllevel','msl level'),         'mrppackagingsize_id': fields.many2one('mrp.packagingsize','packaging size'),         'mrpprocesstype_id': fields.many2one('mrp.processtype','process type'),     }     _order="mrpproduct_partnumber asc"      // manufacturer  class mrpproduct_manufacturer(osv.osv):     _name = "mrpproduct.manufacturer"     _columns = {         'mrpmanufacturer_id': fields.many2one('mrp.manufacturers','manufacturers'),         'mrpmanufacturer_pno': fields.char("manufacturer part number", size=30, required=true),         'mrpmanufacturer_preference': fields.selection([('1','1'),('2','2'),('3','3'),('4','4'),('5','5'),('6','6'),('7','7'),('8','8'),('9','9'),], string="priority"),         'mrpdatasheet': fields.binary('data sheet'),         'mrpproduct_id': fields.many2one('product.template','manufacturer'),     }     _order="mrpmanufacturer_preference desc"


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