Deductions & credits

No, you are incorrect.  Here is some data for you:

1.  Entered both the car and charger and it only showed me the car.

2.  I set the car to zero, and it showed me the charger.

3.  If I modify the car to something less (like $6000.00), then it shows me both.

You did not verify it properly.  You have a sub-routine which limits the total amount, contrary to the law.   Try entering a car credit of $7500, and a charger total cost of $1000.00 and see what you get.  I would love to see a copy of you schedule 3 showing $7800 in total credit.

Please ask someone with authority to fix the software.  I called and the level2 software person brushed me off with a non-usable solution.  

Not a happy customer.