public function generatePurchaseOrder($supplierid, $date, $items)
{
$supplier = Supplier::GetSupplier($supplierid);
$order = PurchaseOrder::CreateOrder($supplier, $date);
foreach ($items as $item) {
$ql = PurchaseOrderLine::Create($order->id, $item['item'], $item['qty'], $item['price']);
$order->addToOrder($ql);
}
$voucher = $order->generate();
if ($voucher) {
echo json_encode($voucher);
} else {
echo 0;
}
}