I run into a ton of situations like this reporting from databases. You could try handling this like a lookup table:

foreach my $bids( keys %{ $config } ){
    foreach my $itemcode( keys %{ $config->{$bids} } ){
        foreach my $inner( @{ $config->{$bids}{$itemcode} } ){
            print $inner; # If you just want to dump your vals
        }
    }
}
[download]

if you like
Adam