public function glbalance()
{
// return last unclosed period, year
$glperiod = DataObjectFactory::Factory('GLPeriod');
$glperiod->getCurrentPeriod();
$year = $glperiod->year;
// get future periods from the last period 0
$temp_future_periods = $glperiod->getFuturePeriods(-1, $year);
// reconstruct periods array, as we cannot send a value (year + period), but period_id
$future_periods = array_keys($temp_future_periods);
array_fill_keys($future_periods, NULL);
// get sum of periods
$sum = GLBalance::getSum($future_periods, $this->_data['glaccount_id'], $this->_data['glcentre_id']);
return $sum;
}
