COBOL Loan Calculation Fix / Dashboard Modification

I maintain a legacy financial framework written entirely in COBOL and have traced a fault to the loan module: the routine that calculates each payment's amount is producing the wrong numbers. The mis-calculation shows itself only during the repayment computation—interest and balance routines elsewhere are fine—so I'm certain the issue sits inside the payment formula or the way rounding/decimal positions are handled.

You'll receive the full source, copybooks, compile JCL, and a test data set that clearly demonstrates the error alongside the correct figures I expect. Your task is to locate the bug, adjust the code (keeping the original structure and naming conventions), and provide back:

• Updated source files with inline comments on what changed
• A short change log explaining the root cause and fix
• A test run (log or screenshot) proving the new repayment amounts match the expected results across the supplied edge-case loans

Please be comfortable reading older COBOL, using the usual mainframe or Micro Focus toolchain, and stepping through numeric computations. Let me know your approximate turnaround and any questions about the environment, and I'll share the repository immediate