Great question!, the use of this field is a bit diverted from the initial design. It was designed to indicate how the measurement was initiated (active, queued, pre-prod, or nnn % of a running job), currently it just indicates if all of the measurement data is imported into PMA. In fact, that is the reason why you see all time 100% indicating that all of your measurements are imported properly. I know we need to change the help to reflect the current use of this and other fields.
Product Architect for CA MAT and PMA