Connect the warehouses in the other system with the warehouses (locations) in Norce, so stock is updated in the right place.
Each row connects:
a warehouse from the other system, and
a Norce Warehouse-Location Code.
Good to know
This is shown when Multiple warehouses on Norce? [Import Stock] is set to Yes.
Stock from warehouses that aren't mapped goes to the Default Norce warehouse [Import Stock].
If the list is empty, check that the other system is connected. An empty list almost always means the connection, not the setting.