[kmymoney4] [Bug 364987] New: Edit Loan Account doesn't properly handle variable rate loans

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364987

            Bug ID: 364987
           Summary: Edit Loan Account doesn't properly handle variable
                    rate loans
           Product: kmymoney4
           Version: 4.7.2
          Platform: MS Windows
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kmymoney-devel at kde.org
          Reporter: mike-harmon at hotmail.com

Hi, KmyMoney doesn't seem to be handling changes to interest rates on loan
accounts correctly.  I have a loan account that tracks a 5/1 ARM - a mortgage
with an initial rate for 5 years which can then change every 1 year after the
initial 5.  

What should happen is that on the date a new rate becomes active, KmyMoney
should re-amortize the remaining balance over the remaining duration, using the
new rate.

What is happening instead is a re-amortization from the loan's inception using
the new rate, with KmyMoney re-calculating the loan's duration.  The step in
the wizard that asks "When should the changes become active?" doesn't seem to
do anything.

In addition, if I leave the interest rate blank, which is supposed to cause the
app to re-calculate it based on the payment amount, it instead becomes 0.

Reproducible: Always

Steps to Reproduce:
1.  Create a loan account, and make payments against it for some number of loan
periods.
2.  Change the interest rate of the loan, effective some time within the loan
duration.
3.  Observe that the loan duration has changed, as if the amortization since
inception was based on the new rate.

Actual Results:  
The loan is re-amortized from inception with the new rate.

Expected Results:  
The loan should be re-amortized as-of the effective date of the change.

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