Our company experiences this invoice double posting on rare occasions when SO-G (invoice posting) does not seem to post the invoice the first time, so one tries it again.
 
To correct the General Ledger out of balance condition, we use GL-P to enter the missing entry, and then also correct the double posting, (reverse the 2nd COS and 2nd Sales revenue entry)  However, this will not correct any DBA report in the sales module.  You will see the invoice number listed twice in SO-O-H, "Invoice Listing report.