First, open the Asset Info pop-up by clicking on the Serial Number, then in the “History” tab click “Add Service Record” 

Then, input the date that the service was completed:

Work Around: click "Next" through all the tabs to save the service event.

Once the “blank” service record is created, click on it to assign it to the correct Maintenance Plan and Task, and check the box to link the service as the Tool Calibration Event:

In the "Order Tab" you can enter in the results. When done, press "OK"