i had the same issue try the following code

def _get_invoice_company(self, cr, uid, ids,args, field_name , context=None):

    period_obj3 = self.pool.get('product.template') 

    invoice = {} 

    for auto1 in period_obj3.browse(cr, uid, ids, context=context):

        prod_temp_id = auto1.id   

        prod_temp_id=[prod_temp_id]

        cr.execute("SELECT aaa.invcompany_id FROM product_template pt INNER JOIN product_product pp on pp.product_tmpl_id = pt.id INNER JOIN account_analytic_invoice_line aal on aal.product_id = pp.id inner join account_analytic_account aaa on aaa.id = aal.analytic_account_id inner join res_company f on f.id = aaa.invcompany_id WHERE pp.product_tmpl_id = %d" %(tuple(partner_id)) )

        res = cr.fetchone() 

        invoice = res[0]

    return invoice

_columns = {

'cm_property_ids': fields.one2many('cm.property', 'product_template_id', 'Products') ,

'invoice_company':fields.function(_get_invoice_company , type='integer' , method=True , string='Invoice Company'),

}

i had the same issue try the following code

def _get_invoice_company(self, cr, uid, ids,args, field_name , context=None):

    period_obj3 = self.pool.get('product.template') 

    invoice = {} 

    for auto1 in period_obj3.browse(cr, uid, ids, context=context):

        prod_temp_id = auto1.id   

        prod_temp_id=[prod_temp_id]

        cr.execute("SELECT aaa.invcompany_id FROM product_template pt INNER JOIN product_product pp on pp.product_tmpl_id = pt.id INNER JOIN account_analytic_invoice_line aal on aal.product_id = pp.id inner join account_analytic_account aaa on aaa.id = aal.analytic_account_id inner join res_company f on f.id = aaa.invcompany_id WHERE pp.product_tmpl_id = %d" %(tuple(partner_id)) )

        res = cr.fetchone() 

        invoice = res[0]

    return invoice

_columns = {

'cm_property_ids': fields.one2many('cm.property', 'product_template_id', 'Products') ,

'invoice_company':fields.function(_get_invoice_company , type='integer' , method=True , string='Invoice Company'),

}