+#!/usr/bin/perl
+# This script finds and fixes missing 090 fields in Koha for MARC21
+# Written by TG on 01/10/2005
+# Revised by Joshua Ferraro on 03/31/2006
+use strict;
+
+# Koha modules used
+
+use C4::Context;
+use C4::Biblio;
+use MARC::Record;
+use MARC::File::USMARC;
+
+
+my $dbh = C4::Context->dbh;
+
+my $sth=$dbh->prepare("select m.biblionumber,b.biblioitemnumber from marc_biblio m left join biblioitems b on b.biblionumber=m.biblionumber ");
+ $sth->execute();
+
+while (my ($biblionumber,$biblioitemnumber)=$sth->fetchrow ){
+ my $record = MARCgetbiblio($dbh,$biblionumber);
+
+ MARCmodbiblionumber($biblionumber,$biblioitemnumber,$record);
+
+}
+
+sub MARCmodbiblionumber{
+my ($biblionumber,$biblioitemnumber,$record)=@_;
+
+my ($tagfield,$biblionumtagsubfield) = &MARCfind_marc_from_kohafield($dbh,"biblio.biblionumber","");
+my ($tagfield2,$biblioitemtagsubfield) = &MARCfind_marc_from_kohafield($dbh,"biblio.biblioitemnumber","");
+
+my $update=0;
+ my @tags = $record->field($tagfield);
+
+if (!@tags){
+
+my $newrec = MARC::Field->new( $tagfield,'','', $biblionumtagsubfield => $biblionumber,$biblioitemtagsubfield=>$biblioitemnumber);
+ $record->append_fields($newrec);
+ $update=1;
+ }
+
+
+if ($update){
+&MARCmodbiblio($dbh,$biblionumber,$record,'',0);
+ print "$biblionumber \n";
+ }
+
+}
+END;