+my $reasonnum = $cgi->param('reasonnum');
+$reasonnum =~ /^(-?\d+)$/ or die "Illegal reasonnum";
+$reasonnum = $1;
+
+my $error;
+if ($reasonnum == -1) {
+ my $new_reason = FS::reason->new({
+ map { $_ => scalar( $cgi->param("select_reason_new_$_") ) }
+ qw( reason_type reason )
+ });
+ $error = $new_reason->insert;
+ $reasonnum = $new_reason->reasonnum;
+}
+
+if ( !$reasonnum ) {
+ $error ||= 'Reason required'
+}
+
+$error ||= FS::cust_credit->credit_lineitems(