The funded hours plus extended childcare hours cannot equal more than the hours at setting. This can be amended by going to the extended tab of the student profile and these fields are at the bottom of the school information section.
If you look at this example:
The funded hours plus the extended childcare hours equal 30 however the hours at setting is listed as 25. In this case to clear the error you would either update the hours at setting to 30 or the extended childcare hours to 10.