static function addStock($item, $branch, $quantity)
{
$records = fRecordSet::build('Inv_stock', array('item_id=' => $item, 'branch_id=' => $branch));
if ($records->count()) {
foreach ($records as $record) {
$record->setQuantity($record->getQuantity() + $quantity);
$record->store();
}
} else {
$record = new self();
$record->setBranchId($branch);
$record->setItemId($item);
$record->setQuantity($quantity);
$record->store();
}
}
