- 

$DBversion = 'XXX'; # will be replaced by the RM

if( CheckVersion( $DBversion ) ) {

    # you can use $dbh here like:

    $dbh->do( "UPDATE systempreferences set value=0 where variable='maxoutstanding' and (value='' or value is null)" );

    # or perform some test and warn

    # if( !column_exists( 'biblio', 'biblionumber' ) ) {

    #    warn "There is something wrong";

    # }

    # Always end with this (adjust the bug info)

    NewVersion( $DBversion, 25220, "maxoutstanding should be disabled by a null value");

}