Enable us to change which reading list item a digitisation is linked to

Currently, once a digitisation is linked to a reading list item, it cannot be unlinked/relinked to a different reading list item.

This is highly frustrating.

To would very useful if a digitisation could be unlinked/relinked to another reading list item, even if this was limited to only being able to relink to list items that had the same time period.