Cannot edit Backup Definition because schedule has "Run Now & Every ..."

Backup Exec 15
Version 14.2 Rev 1180
Installed updates: Feature Pack 5, Hotfix 115844, Hotfix 116031, Hotfix 116730, Hotfix 126145 (LiveUpdate shows up-to-date.) 

I need to edit the selection list of a Backup Definition, but I cannot 'save' the Backup Definition as I get the error:

Schedule specified for 'D' task is invalid.
The server has recieved incorrect or invalid data.

If I look at the 'D' task it is set to "Run Now & Every ..."

However in the schedule settings there is no such thing as "Run Now".

How can I edit this Backup Definition?

I try to avoid recreating this Backup Definition as the selection list is 'complex' and a new Backup Definition requires that a full backup is run. (Side question: how to a 'save' or re-use a selection.)