When the user closes the transfer order the following error shows.
Transfer order lines cannot be closed when there are remaining quantities to be received.
Both the Fulfilled and Received Columns should be exposed on the Transfer Order Form.
1. Using the Administrator role, navigate to Setup > Customization > Transaction Forms
2. Click Edit link next to the transfer order form marked as Preferred
3. Under the Screen Fields tab > Items subtab, mark Show box next to Fulfilled and Received fields
4. Click Save button
5. User can now go back to the transfer order to Close the transfer order record