Link an existing calendar item to a UCI calendar item
You can retrospectively link an existing calendar item to a UCI calendar item.
On the bottom of the edit page of a calendar item the reference section. Where you find the link to the UCI calendar item.

Pressing the pen button will open the search screen for UCI calendar items. Once it is linked the icons will change.

Pressing the red unlink button will remove the reference. The blue button will refresh the data in the calendar item with the data of the UCI calendar.