This X12 Transaction Set contains the format and establishes the data contents of the Credit/Debit Adjustment Transaction Set (812) for use within the context of an Electronic Data Interchange (EDI) environment.  The transaction set can be used to notify a trading partner of an adjustment or billback and may be used to request an adjustment or billback.  It identifies and contains the details and amounts covering exceptions, adjustments, credits, or debits for goods or services.  This transaction set is multidirectional between trading partners.