How to RELEASE a WAREHOUSE LOT
go to the main menue and click on "warehouse lot release"

go to "new"

fill in the required information and click on "select"

now select your lot and click on "ok"

go to "set status"

now set the status first to "approved" (1) and then to "released" (2)
If you would like to have more information, please check out the following links regarding Outbound bookings:
Outbound Booking fundamentals
Outbound Booking advanced