Self-employed

You are correct!  The vehicle expenses have to be entered twice. The difference will be in KM  driven for business but all expenses and vehicle information will be identical. 

Example: you drove during the year 10000 km. Out of which 2000 for business #1 and 3000 for business #2. The rest for personal use. You need to enter full details for vehicle in each business  and TTO will allocate 20% of vehicle expenses to  business #1 and 30 % to business #2.