How can I set up an amortized loan in Reckon PP?

I used the Add Loan feature to set up a new account where I am the mortgagee for an amortized loan where payments include Principal and Interest. Instead of applying only the Principal component as a reduction of the balance owing after each payment, Reckon PP is also including the Interest component to show an incorrect balance owing.

On a $516,374.00 loan with an interest rate of 5.1% and weekly repayments over a 30 year term, the correct calculation after the first payment of $646.71, which constitutes $140.27 Principal and $506.44 Interest, produces a balance owing of $516,233.73.

However, PP shows the balance owing as $515,727.29, counting the entire payment as a reduction of the Principal.

Is there a fix to this?