Error 3100: Extended childcare hours have been entered where pupil is not in the eligible age range or year groups or does not have a valid 30 hour code

This error arises when a student has data in the Extended Childcare Hours section on their profile's Extended Tab, but no 30 hour code is entered. 

You will need to either amend the hours, or remove the code: Hours at setting, funded hours, extended or expanded hours and 30 hour codes