Meaning of the field 'open' and 'remaining quantity' in the item ledger entries
If you notice all the lines with Remaining Qty. = 0 are Closed (ie Not Open). This means the system has applied the received quantity against some outgoing quantity (shipment/consumption/transfer/etc.). In your highlighted line, you received 12 units, you have used 1 unit, so you have 11 remaining units. The line is marked Open because there is still remaining quantity available in inventory. Once the remaining quantity has been used, the Open flag will be unchecked, meaning that entry is Closed.
Furthermore, it looks like you are using FIFO since the system is consuming from the oldest entry in the Item Ledger. This might be clearer if your sort order was by Posting Date.
Best Regards,
Ben Baxter
Accent Software Inc