Choose the Fortnox stock point (warehouse) to use by default.
It is used:
when syncing stock, and
on order rows, when no other mapping is found.
Good to know
This is shown when Use Warehouses for stock is turned on.
Only values that exist in Fortnox can be chosen. If one is missing, create it in Fortnox first, then click Clear Cache on the settings page so the list is refreshed.
If the list is empty, check that Fortnox is connected. An empty list almost always means the connection, not the setting.