I've found the reason. It's hidden with code.
Go to the file modules/Premium/Warehouse/Items/Orders/Orders_0.php
and change 279 line from
$order = array(array('item_name'=>$arg['id']), array('quantity_on_hand'=>false,'description'=>false)+('item_name'=='item_name'?array('item_name'=>false):array()), array('transaction_date'=>'DESC', 'transaction_id'=>'DESC'));
to
$order = array(array('item_name'=>$arg['id']), array('quantity_on_hand'=>false)+('item_name'=='item_name'?array('item_name'=>false):array()), array('transaction_date'=>'DESC', 'transaction_id'=>'DESC'));
This change will be available in the new store package, but we've got a lot of changes that we have to test before the next release of the Inventory Management module.
Regards,
Adam
