[Koha] Export Biblios by Holdingbranch

Hello, I'm trying to export the books hold by a specific library using the "items.holdingbranch" In order to do that I was trying to edit the "export.pl" script changing: my $conditions = { ... ( @branchcodes ? ( 'items.homebranch' => { in => \@branchcodes } ) : () ), to: ( @branchcodes ? ( 'items.holdingbranch' => { in => \@branchcodes } ) : () ), I analyzed the code and it should works, but the result still the same, I got only homebranch results. Any idea how to do that? BR, Giuseppe