I have seen this (or something similar) at one of my clients that uses PC Charge. After digging into it I noticed that the deposit amount on the sales order did not get passed through to the SO invoice. We instructed the person that reviews the invoices to make sure there is not a balance due other than freight charges. Upon further investigation I noticed that on the AR Transaction report, there was occasionally, a couple of times a month, transactions listed without an authorization code. At this point it seems like two separate issues, but they could be related. They are now reviewing the deposit transaction report regularly for unauthorized transactions. They are also in the process of upgrading from 4.4 to 2014 AND moving to SPS.