Update flatten route

I created a harness route and a flatten configuration of the harness. I then went and updated the length of the harness cable. The length in the routed config shows an increased length but the flatten configuration does not show the extra added length. How do I update this? Do I need to delete the current flatten route and create a new config? If I do this I will lose all my annotation done in drafting.

SolidworksRouting