DIP - 1 Day equal to 24 Hours of Work

Hi,

I've created a DIP which use Cost Elements as Characteristic.

The problem is that in the internal activities, if I set as work unit 'D' (Days) it takes 24 hours for each day as original quantity.

I want to take only 8 hours for each day, as I've set on the Work Center capacity.

How may I change it?

Thanks