Purchase order - drafts implementation

Hi,
Right now in SDP if you start the PO and then navigate to another tab or link in SDP, the PO changes are not saved anywhere making user re-enter the same PO numerous times.

I would like to suggest implementing drafts approach in the similar way it works in MS Outlook:

1. Then trying to navigate away from the newly opened PO, the dialog will appear asking if user wishes to save the incomplete PO to drafts (folder?) or discard the changes. If yes, the order will be saved into drafts place with no PO number (or temporary po number to distinguish between multiple drafts) assigned to it. Currently assigned PO number is released towards next completed PO.

2. If SDP was closed (browser close, system unexpected reboot) the PO should be auto-saved with all the changes made and available in drafts folder.

3. A user should manage/search/view/delete those drafts at his wish.

4. When a draft po is re-opened, the next available PO number is assigned to it.

Thanks!
Miron