+$param->{'tax_override'} =~ /^\s*([,\d]*)\s*$/
+ or $error .= "Illegal tax override " . $param->{"tax_override"} . " ";
+my $override = $1;
+
+if ( $param->{'taxclass'} eq '(select)' ) {
+ $error .= "Must select a tax class. "
+ unless ($conf->exists('enable_taxproducts') &&
+ ( $override || $param->{taxproductnum} )
+ );
+ $cgi->param('taxclass', '');
+}
+
+unless ( $error ) {
+ my $cust_main = qsearchs('cust_main', { 'custnum' => $custnum } )
+ or $error .= "Unknown customer number $custnum. ";
+
+ $error ||= $cust_main->charge( {
+ 'amount' => $amount,
+ 'quantity' => $quantity,
+ 'bill_now' => scalar($cgi->param('bill_now')),
+ 'invoice_terms' => scalar($cgi->param('invoice_terms')),
+ 'start_date' => ( scalar($cgi->param('start_date'))
+ ? parse_datetime($cgi->param('start_date'))
+ : ''
+ ),
+ 'no_auto' => scalar($cgi->param('no_auto')),
+ 'pkg' => scalar($cgi->param('pkg')),
+ 'setuptax' => scalar($cgi->param('setuptax')),
+ 'taxclass' => scalar($cgi->param('taxclass')),
+ 'taxproductnum' => scalar($cgi->param('taxproductnum')),
+ 'tax_override' => $override,
+ 'classnum' => scalar($cgi->param('classnum')),
+ 'additional' => \@description,
+ } );
+}