Back when we were going through the FDM mapping exercise, the PG00847 DO NOT MAP code was created to tag PTAOs we thought were no longer in use.
These aren't unallowed codes; instead, they are meant as a "red flag" to signal that the transaction needs to be checked. These often result from PTAOs we thought weren't in use anymore but were somewhere in a database to be used for a recurring charge. If you need to change for ISD billing, just contact the ISP.
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