GnuCash 2.6.12
Window 7 32bit

When I try to use Scheduled Transactions and make it more automatic.

So I modified the "fin.scm" to meet what I need.

But I can't do it. It always shows the error message "Couldn't parse redit-formula".

The credit-formula is "computeInterestIncrementFixed(10422:i)"

However, if I replaced "i" with "-i" like "computeInterestIncrementFixed(10422:-i)", it would be OK.

But It is not what I need.

There are source code as below. And I run it online working fine.

https://repl.it/CLmn/1

;; for fixed rate once in a year
(define ratePublic 0.0116)

(define (gnc:futureValueR a t)
    (if (<= t 0)
        a
        (round (* (+ 1 ratePublic) (gnc:futureValueR a (- t 1))))
     )
)

(define (gnc:computeInterestIncrementFixed a t)
  (let ((thisVal (gnc:futureValueR a t))
        (prevVal (gnc:futureValueR a (- t 1)))
       )
    (- thisVal prevVal)
  )
)

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