I want to get the Previous Balance Sheet report to compare it in new balance sheet.. There is no error appear but it doesn't get the id of the previous data of my balance sheet. can someone please help me. thanks in advance..

here my codes:

def _build_context_prev(self, cr, uid, ids, data, context=None):
        if context is None:
            context = {}
        result = {}
        result['fiscalyear'] = 'fiscalyear_id' in data['form'] and data['form']['fiscalyear_id'] or False
        
        fiscal_ids = self.pool.get('account.fiscalyear').search(cr,uid,[('id','=',result['fiscalyear'])])
        #fiscal_ids1 = self.pool.get('account.fiscalyear').search(cr,uid,[('','=',result['fiscalyear'])])
        
        fiscal_year1= 'fiscalyear_id' in data['form'] and data['form']['fiscalyear_id'] or False
        
        period_from1 = False
        period_to1 = False
        
        date_from1 =''
        date_to1 = ''
        
        
        year1 = ''
        for fiscal in self.pool.get('account.fiscalyear').browse(cr,uid,fiscal_ids):
            max_date = fiscal.date_stop
            fiscal_ids1 = self.pool.get('account.fiscalyear').search(cr,uid,[('date_stop','<',max_date)])
            max_date1= ''
            for fiscal1 in self.pool.get('account.fiscalyear').browse(cr,uid,fiscal_ids1):
                netsvc.Logger().notifyChannel("OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOPPPPP555555555555555555555AAAA!!!:: ",netsvc.LOG_INFO, '' + str(max_date))
                netsvc.Logger().notifyChannel("OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOPPPPP555555555555555555555BBBB!!!:: ",netsvc.LOG_INFO, '' + str(fiscal1.date_stop))
                netsvc.Logger().notifyChannel("OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOPPPPP555555555555555555555CCCC!!!:: ",netsvc.LOG_INFO, '' + str(max_date1))
                
                if max_date1 == '':
                    max_date1 = fiscal1.date_stop
                    
                
                elif date(max_date) > fiscal1.date_stop & date(max_date1) <= fiscal1.date_stop:
                    max_date1 = fiscal1.date_stop
                    fiscal_year1 = fiscal1.id
                    
                    #year
                    """period_ids = self.pool.get('account.period').search(cr,uid,[('fiscal_year_id','=', fiscal1.id)])
                    max_period1= False
                  
                    for period in self.pool.get('account.period').browse(cr,uid,period_ids):
                        if max_period1 != :
                           max_period1= period.id
                        
                        if max_period1 < period.date_stop:"""
                            
                    
        result['fiscalyear'] =    fiscal_year1
            
        result['journal_ids'] = 'journal_ids' in data['form'] and data['form']['journal_ids'] or False
        result['chart_account_id'] = 'chart_account_id' in data['form'] and data['form']['chart_account_id'] or False
        if data['form']['filter'] == 'filter_date':
            result['date_from'] = data['form']['date_from']
            result['date_to'] = data['form']['date_to']
            
        
        elif data['form']['filter'] == 'filter_period':
            if not data['form']['period_from'] or not data['form']['period_to']:
                raise osv.except_osv(_('Error!'),_('Select a starting and an ending period.'))
            result['period_from'] = data['form']['period_from']
            result['period_to'] = data['form']['period_to']
        netsvc.Logger().notifyChannel("OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOPPPPPPPPPPPPPPPPPPPPPPPPPPPPP44444444444!!!:: ",netsvc.LOG_INFO, '' + str(result))
        return result

Heres the error occured:

Server Traceback (most recent call last): File "/opt/openerp/server-7/openerp/addons/web/session.py", line 90, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/opt/openerp/server-7/openerp/netsvc.py", line 293, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/opt/openerp/server-7/openerp/service/web_services.py", line 626, in dispatch res = fn(db, uid, *params) File "/opt/openerp/server-7/openerp/osv/osv.py", line 188, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/opt/openerp/server-7/openerp/osv/osv.py", line 131, in wrapper return f(self, dbname, *args, **kwargs) File "/opt/openerp/server-7/openerp/osv/osv.py", line 197, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/opt/openerp/server-7/openerp/osv/osv.py", line 185, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/opt/openerp/biz1_server70_addons/biz1_cash_flow1/accounting_report.py", line 139, in check_report1 used_context1 = self._build_context_prev(cr, uid, ids, res['datas'], context=context) File "/opt/openerp/biz1_server70_addons/biz1_cash_flow1/accounting_report.py",

line 86, in _build_context_prev elif date(max_date) > fiscal1.date_stop & date(max_date1) > fiscal1.date_stop:

TypeError: an integer is required