foreach ($saft->transactions as $transaction) {

            $month = intval(date('m', strtotime($transaction->transactionDate)));

            foreach ($transaction->debitLines as $debitLine) {

                $accountID = $debitLine->accountID;

                if (!array_key_exists($accountID, $saft->preProcessed)) {
                    for ($i = 0; $i < 12; $i++) {
                        $saft->preProcessed[$accountID][$i] = (object) [
                            'debit' => 0,
                            'credit' => 0
                        ];
                    }
                }

                $saft->preProcessed[$accountID][$month - 1]->debit += $debitLine->debitAmount;
            }

            foreach ($transaction->creditLines as $creditLine) {

                $accountID = $creditLine->accountID;

                if (!array_key_exists($accountID, $saft->preProcessed)) {
                    for ($i = 0; $i < 12; $i++) {
                        $saft->preProcessed[$accountID][$i] = (object) [
                            'debit' => 0,
                            'credit' => 0
                        ];
                    }
                }

                $saft->preProcessed[$accountID][$month - 1]->credit += $creditLine->creditAmount;
            }
        }