Print on Invoice Detached workaround for a credit with no return (non-stock)

We are trying to use an advanced pricing adjustment with print on invoice detached (Adjustment Control Code=6) for a customer who has a negotiated discount of 1% for all items shipped & invoiced.  All looks good for the sales order, but when a no return credit is issued, the discount is shown on the online invoice, there is a record in F4074, but is not printed on the invoice or transmitted via EDI 810.  When Sales Update is run, the discount is applied to A/R as well as to the correct G/L account.  So, the invoice to the customer does