My problem was actually in populating my %titles_prd_order_allowed, which I didn't include, trying to keep it short - sorry. Sorted now, thanks.

    my @low_values_prd_order_allowed = ();
    my %meanings_prd_order_allowed   = ();
    my %titles_prd_order_allowed   = ();
    my $stmt                         = "SELECT value, meaning, title
    FROM OPTIONS
    ";
    my $sth = $dbh->prepare($stmt);
    $sth->execute();

    while ( ( $value, $meaning, $title ) = $sth->fetchrow_array() ) {
        push( @low_values_prd_order_allowed, $value );
        $meanings_prd_order_allowed{$value} = $meaning;
        $titles_prd_order_allowed{$value} = 
            ( $value =>{'title'=> $title} );
    }
    print $q->label(
        { -for => 'idprd_order_allowed' },
        "ORDER ALLOWED"
        );
       print $q->popup_menu(
        -id       => 'idprd_order_allowed',
        -name     => 'prd_order_allowed',
        -override => 1,
        -onChange => "changeInCore=true",
        -default  => $prd_order_allowed,
        -value    => [@low_values_prd_order_allowed],
        -labels   => \%meanings_prd_order_allowed,
        -attributes    => \%titles_prd_order_allowed
        );

[download]

I (being a numpty) previously had:

$titles_prd_order_allowed{$rv_low_value} = $title;

In reply to Re^2: Adding attributes to select list options in CGI.pm popup_menu? by backedge
in thread Adding attributes to select list options in CGI.pm popup_menu? by backedge

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