Hi community, 

while working on Delivery in 3 steps: Pick pack, ship. I have activated Packages in Configuration and  Move Entire Packages in operation Type Internal transfers. 

When i put products in Pack, i get the right packaging but don't understand what the model stock.package_level is for. 

Can someone explain to me the functional use of Stock Package Level which refers to the  model Stock Package Level ?
For example :
why would we need a state for packaging products ?
why does it have to be Draft after validating  the Ship ?
After validation of Ship, why does new record(s) apprear in field move_line_ids_without_package ? ( i presume this field only contains move line non related to a package as its name refers to. that is to say, a product that is not packed.. )

 I can only see its relation with stock.quant.package, stock.move.line and stock.move 

Appreciated.

Regards.