+=head1 CLASS METHODS
+
+=over 4
+
+=item credited_sql
+
+Returns an SQL fragment to retreive the unapplied amount.
+
+=cut
+
+sub credited_sql {
+ #my $class = shift;
+
+ "amount
+ - COALESCE(
+ ( SELECT SUM(amount) FROM cust_credit_refund
+ WHERE cust_credit.crednum = cust_credit_refund.crednum )
+ ,0
+ )
+ - COALESCE(
+ ( SELECT SUM(amount) FROM cust_credit_bill
+ WHERE cust_credit.crednum = cust_credit_bill.crednum )
+ ,0
+ )
+ ";
+
+}
+
+=back
+