With this Error, where a 30 hour code is entered for a nursery student the Funded Hours must not be greater than 15.
On the student profile's Extended Tab, under School Information check that the Funded Hours and Extended Hours adds up to the Hours at Setting.
For example, the Funded Hours must not be greater than 15 and the Extended Hours also to be less than or equal to 15. Amend the hours, then save at the base of the Extended Tab.