Hi Silpa,

You can achieve it using a combination of _rec_name,name_search and name_get methods as follows:

1. You need to define _rec_name like:

_rec_name = 'mobile'

2. Need to override name_search as:

def name_search(self, cr, user, name='', args=None, operator='ilike', context=None, limit=100):

        res = super(res_partner,self).name_search(cr,user,name,args,operator,context,limit)

        if not res:

                ids = self.search(cr, user, [('mobile',operator,name)], limit=limit, context=context)

                res = self.name_get(cr, user, ids, context=context)

        return res

3. Need to override name_get as:

def name_get(self, cr, uid, ids, context=None):

        if context is None:

                context = {}

        if isinstance(ids, (int, long)):

                ids = [ids]

        res = []

        reads = self.read(cr, uid, ids, ['name', 'mobile'], context=context)

        for record in reads:

                if record['name']:

                        name = record['name']

                res.append((record['id'], name))

        return res