From Warehouse

Enter the warehouse from which inventory is to be moved.

Because a multi-site quantity move can be either a "push" or "pull" transaction, the default for this field is relative to the site initiating the transaction. Generally, the default for this field is the default warehouse associated with the site designated in the From Site field. If that site is the site where you are located when initiating the move, the default warehouse is the warehouse recognized by the system as the "current warehouse."

For more information about how warehouse values default, see About Warehouses.