$qoh = get_qoh_on_date($stock_item->stock_id,
$_POST['Location'], $_POST['delivery_date']);
if (($stock_item->qty_dispatched -$stock_item->qty_done) > $qoh)
$qoh = get_qoh_on_date($stock_item->stock_id,
$_POST['Location'], $_POST['delivery_date']);
if (($stock_item->qty_dispatched -$stock_item->qty_done) > $qoh)