Journals are used to create specific transactions within the Sales Unposted Transactions file. The Journal Entry window should not be used unless the user has an understanding of the general ledger. Most transactions should be created within the invoice and payment windows.
The Sales > Journal Entry window is the same as all the other journal entry windows except it posts to the Sales Unposted Transaction file. An advantage to using the journal entry option through sales is that you can enter all the sales adjustment journals in this window. This can ease frustration in trying to find an entry that relates to sales as opposed to looking through hundreds of other journals that have nothing to do with sales.
Review the General Ledger > Journals section of the main documentation for details on creating, viewing, and voiding journals.