Transactions that are not posted show a reference of 'unposted [product] transaction'. Because the journal reference and posting information can be changed prior to posting, this information is not recorded until the transaction is actually posted.

To view the Journal References of the unposted transactions, run the Pre Posting Report with the same parameters as the General Ledger Report. The transaction number on the Pre Posting Report will match the "0-#" on the GL report. The pre Posting Report will have proper Journal Reference for the transactions.

Or

Create a query of not yet posted transactions.