sub stocknumber_checker { #code reused later on

  my @row;

  #drop the obsolete itemSStocknumber idx if it exists

  @row = $dbh->selectrow_array("SHOW INDEXES FROM items WHERE key_name='itemsstocknumberidx'");

  $dbh->do("ALTER TABLE `items` DROP INDEX `itemsstocknumberidx`;") if @row;

  #check itemstocknumber idx; remove it if it is unique

  @row = $dbh->selectrow_array("SHOW INDEXES FROM items WHERE key_name='itemstocknumberidx' AND non_unique=0");

  $dbh->do("ALTER TABLE `items` DROP INDEX `itemstocknumberidx`;") if @row;

  #add itemstocknumber index non-unique IF it still not exists

  @row = $dbh->selectrow_array("SHOW INDEXES FROM items WHERE key_name='itemstocknumberidx'");

  $dbh->do("ALTER TABLE items ADD INDEX itemstocknumberidx (stocknumber);") unless @row;

}

$DBversion = '3.05.00.XXX';

if (C4::Context->preference("Version") < TransformToNum($DBversion)) {

    #follow up fix 5860: some installs already past 3.3.0.42

    stocknumber_checker();

    print "Upgrade to $DBversion done (Fix for stocknumber index)\n";

    SetVersion ($DBversion);

}