I am using the IF function for a range of cells and trying to get an error
alert to pop up when incorrect data is entered. I have been following all the
steps I need to take, but it doesn't seem to work. The cell referred to does
show error, but the opo up does not appear.

Heres an example :

For Cell E107 : =IF(E108+E109+E11032,"ERROR ALERT",E108+E109+E110)

And then I highlighted E108,109 & 110 and went into data validation,
specified the whole number to be no greater than cell E107 and entered the
error details for pop up. Also clicked the show pop up tab.

However, when incorrect data is entered, Cell E107 does say error, but the
pop up does not appear.

Any ideas?