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if ($po->status->name eq 'Pending') {
    # po can be sent
...
if ($po->status->name eq 'Pending' || $po->status->name eq 'Sent') {
    # po can be cancelled
}

if ($po->can_send) {
    # po can be sent
...
if ($po->can_cancel) {
    # po can be cancelled
}