What happens to the associated assets when you cancel a transfer order line on a...

A transfer order is a document that records the movement of assets from one location to another1.

A transfer order line is a record that specifies the quantity and type of assets to be transferred1.

When you cancel a transfer order line, the associated assets are released from the transfer order and their state changes from Pre-allocated to Available1.

The released assets can then be attached to another transfer order or used for other purposes1. References:

Transfer orders - Product Documentation: Rome - ServiceNow