$TMPL_VAR{payment_terms_obj} = get_payment_terms_for_invoice();
$form->{duedate} = $TMPL_VAR{payment_terms_obj}->calc_date(reference_date => $form->{invdate}, due_date => $form->{duedate})->to_kivitendo if $TMPL_VAR{payment_terms_obj};
$TMPL_VAR{payment_terms_obj} = get_payment_terms_for_invoice();
$form->{duedate} = $TMPL_VAR{payment_terms_obj}->calc_date(reference_date => $form->{invdate}, due_date => $form->{duedate})->to_kivitendo if $TMPL_VAR{payment_terms_obj};