How to change the format of the cell in input schedules

Hi gurus

I tried to change the format of the cel in input schedulesl, but I can not, for example

when I insert 80 in the cell, and i send the data the system switches to -80 and the report shows (80) y when i insert -80, the system switches the number to 80

I want it when you insert 80, the system keeps 80 and do not change

Anyone know how to do that?

thanks

regards