I need to delete a Work Order that was done in error.

First I need to delete the Work TASK. 
The Work Task has Work Assignment that needs to be deleted first.

When I used the “Remove” button on the “Assign Work” pop-up window, I get the error message:

“Unable to delete visit chain. It has visit(s) with status Completed/Incompleted or with transactions.”

I only have one visit (Visit ID = 1 on this Work Assignment on this Work Task and the “Has Follow On Visits” box is UNchecked.

How can I get rid of this Work Assignment, so I can delete the Work Task and then the Work Order? 

Thanks