The Post Journal Entries module gives the ability to create a journal entry and search previous journal entries.

Creating Journal Entry

First, select "Open New Journal Entry" and enter a description - then save. Once it is saved the Account Breakdown screen will open and you can add entries for the credit and debit side of the payment. 

Searching Journal entries

When you open the journal entry module all previous entries will show on the left of the screen. To search entries type in the Refno (reference number) and it will automatically populate.