trying to change the document name

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I’ve seen in the FAQ that it say you can put a code in functions to change the name i just copy paste and change the name but when i receive the invoice it does not change

Here is the code i put

add_filter( 'wpo_wcpdf_invoice_title', 'wpo_wcpdf_invoice_title', 10, 2 );
function wpo_wcpdf_invoice_title ( $title, $document ) {
    $title = 'Comanda';
    return $title;
}