When creating a new enrollment I get an error message “Duplicate overlapping formal enrollment exists” and gives an enrollment ID.

Make a note of the Enrolment ID.
KM5 – Tools – Query Enrolment – enter the ID – Import.
Create Enrolment– Type of Care – highlight the child and Synchronise Single.
If the record won’t import because it is an Informal enrolment or the details are incorrect (eg. Parent DOB resetting to 1901) call the Help Desk on (07) 5594-0519.