Recursive expression rule

The expression rule below should return a list of dictionary containing loanAmount and monthlyPrincipal. It gives me a strange Expression evaluation error : with no specific errors.

If I change ri!loanAmount <= 0, to be ri!loanAmount <= 28824, it works for some reason. Not sure why and not sure what's going on.

This rule has a rule input called ri!loanAmount of type number(decimal) which I am testing with 100000 as a test scenario to make this work. 

Any ideas what's going on? If there are any other ways to get this to work without doing recursion, please let me know.

a!localVariables(
  
  local!principalPayment: 100000,
  local!interest: 15,
  local!loanTermYears: 30,
  local!periodicInterestRate: (local!interest/100)/12,
  local!periodicInterestRateModified: 1+local!periodicInterestRate,
  local!periodicInterestRateModifiedToPower: power(local!periodicInterestRateModified, local!loanTermYears*12),
  local!xx: local!periodicInterestRateModifiedToPower - 1,
  local!xxx: local!periodicInterestRate*local!periodicInterestRateModifiedToPower,
  local!monthlyPayment: local!principalPayment / (local!xx / local!xxx),

  local!monthlyPrincipal: local!monthlyPayment - (ri!loanAmount * local!periodicInterestRate),
  if(
    ri!loanAmount <= 0,
    {},
    {
      {
        loanAmount: ri!loanAmount - local!monthlyPrincipal,
        monthlyPrincipal: local!monthlyPrincipal,
      },
      rule!LO_recursiveRule(
        loanAmount: ri!loanAmount - local!monthlyPrincipal
      )
    }
  )
)

Second approach to indicate the number of iterations. Here I am using local!loanTermMonths to stop the recursion. It works until 26 (Starting from 360 going down) but if I change to 25 or less, it breaks with same error. So that's 334 iterations.

a!localVariables(
  
  local!principalPayment: 100000,
  local!staticLoanTerm: 360,
  local!interest: 15,
  local!loanTermMonths: ri!loanTermMonths,
  local!periodicInterestRate: (local!interest/100)/12,
  local!periodicInterestRateModified: 1+local!periodicInterestRate,
  local!periodicInterestRateModifiedToPower: power(local!periodicInterestRateModified, local!staticLoanTerm),
  local!xx: local!periodicInterestRateModifiedToPower - 1,
  local!xxx: local!periodicInterestRate*local!periodicInterestRateModifiedToPower,
  local!monthlyPayment: local!principalPayment / (local!xx / local!xxx),

  local!monthlyPrincipal: local!monthlyPayment - (ri!loanAmount * local!periodicInterestRate),
  if(
    local!loanTermMonths = 26,
    {},
    {
      {
        loanAmount: ri!loanAmount - local!monthlyPrincipal,
        monthlyPrincipal: local!monthlyPrincipal,
      },
      rule!LO_calculateAmortizationSchedule(
        loanAmount: ri!loanAmount - local!monthlyPrincipal,
        loanTermMonths: local!loanTermMonths-1
      )
    }
  )
)

This one does work (it is less number of iterations because instead of 360 months I am doing half (180).

a!localVariables(
  
  local!principalPayment: 100000,
  local!staticLoanTerm: 180,
  local!interest: 15,
  local!loanTermMonths: ri!loanTermMonths,
  local!periodicInterestRate: (local!interest/100)/12,
  local!periodicInterestRateModified: 1+local!periodicInterestRate,
  local!periodicInterestRateModifiedToPower: power(local!periodicInterestRateModified, local!staticLoanTerm),
  local!xx: local!periodicInterestRateModifiedToPower - 1,
  local!xxx: local!periodicInterestRate*local!periodicInterestRateModifiedToPower,
  local!monthlyPayment: local!principalPayment / (local!xx / local!xxx),

  local!monthlyPrincipal: local!monthlyPayment - (ri!loanAmount * local!periodicInterestRate),
  if(
    local!loanTermMonths = 0,
    {},
    {
      {
        loanAmount: ri!loanAmount - local!monthlyPrincipal,
        monthlyPrincipal: local!monthlyPrincipal,
      },
      rule!LO_calculateAmortizationSchedule(
        loanAmount: ri!loanAmount - local!monthlyPrincipal,
        loanTermMonths: local!loanTermMonths-1
      )
    }
  )
)