Transaction numbers
Transaction numbers allow you to group entries with the same document number and date, so that you can balance them together.
The Set Period Trans. Nos. batch job assigns Period Trans. No. values to existing general ledger entries in posting date and transaction number order. Entries with the same posting date and transaction number receive the same period transaction number. Numbering starts at 1 for the first general ledger transaction, or at 2 when the batch starts at a later fiscal year boundary. The batch job doesn't create an opening transaction.
When you enter a transaction number in the first line of a journal, the same transaction number is automatically entered into the other lines if the entries aren't balanced. If the entries are balanced, the next number in the sequence is automatically entered into the other lines.
Having sequential period transaction numbers, ordered by date, allows you to identify transactions posted in a fiscal year.