have a few hundred netvault jobs to change schedules on - cli command syntax not working

sample syntax 

nvjobmodify -jobid 72 -type backup -change Set:S="M-F 22:30 GMT"
nvjobmodify -jobid 70 -type backup -change Set:S="M-F 23:00 GMT"


Unrecognised set type
No modifications made to job

I am somewhat desperate not to have to do this by hand in the gui

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