-Adds this refund to the database, and updates the credit (see
-<A HREF=".././FS/cust_credit.html">the FS::cust_credit manpage</A>).
+Adds this refund to the database.
+<P>For backwards-compatibility and convenience, if the additional field crednum is
+defined, an FS::cust_credit_refund record for the full amount of the refund
+will be created. In this case, custnum is optional.</P>