I have updated the data in my source system so why is SystemView is still showing the data error?

SystemView will show changes to the data after the next data refresh.

SystemView receives data from many different sources and each data set refreshes at different intervals. For example, waiting lists refresh daily, whilst Emergency Department "live" data refreshes every 5 minutes. If a record is amended within the source system, SystemView will pick up this change during the next refresh.