The ‘Shipping–Inventory Transfer’ function in sql-ledger 2.6.27 and earlier versions allowed you to transfer goods between warehouses. This was removed in sql-ledger 2.8.1 and onwards by the author.
Though this function is very basic, a number of people requested to get this functionality back into the sql-ledger. We just took the code from 2.6.27 and added it to our enhanced sql-ledger available through our git repository.
Shipping module documentation can be found here.