[kmymoney] [Bug 406131] New: Loan balance reused when changing loan settings

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https://bugs.kde.org/show_bug.cgi?id=406131

            Bug ID: 406131
           Summary: Loan balance reused when changing loan settings
           Product: kmymoney
           Version: 4.7.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kmymoney-devel at kde.org
          Reporter: lp.allard.1 at gmail.com
  Target Milestone: ---

SUMMARY
I have a mortgage setup in KMM 4.7.2 which I have been paying off for almost
10years now, which means the balance NOW is less than half of what it was
initially.

Now I am renewing my mortgage term with different rate, and to accelerate the
payoff of this loan I have voluntarily asked for an amortization smaller than
initially remaining.  The effect is a somewhat larger payment.

The issue is that when I change the parameters of the loan (rate, remaining
payments, etc), KMM insists in reusing the initial loan amount (from 10years
ago) instead of the RESIDUAL balance (now) which is nonsense and as a result,
the calculated "balloon" payment is insanely large.

STEPS TO REPRODUCE
1. Setup a loan in KMM 4.7.2
2. Pay it off for a while until balance is much lower
3. Change settings of loan and see the balloon payment gets miscalculated

OBSERVED RESULT
Balloon payment calculation seems to use this

(Initial loan amount) - (Remaining number of payments) x (payment amount) =
(Balloon payment)

EXPECTED RESULT
Should use this
(Actual/remaining loan amount) - (Remaining number of payments) x (payment
amount)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Mint 17.3 / KDE 4.14.2

ADDITIONAL INFORMATION
KMM is outdated on my system because compiling from source doesnt work
(apparently Mint 17.3 is too "old"), and no newer KMM packages are available
for Mint 17.3.  Using a newer version of KMM would require either upgrading
this entire computer.

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