[OASIS Issue Tracker] Created: (OFFICE-2219) PMT: add constraintsand note

PMT: add constraints and note
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                 Key: OFFICE-2219
                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-2219
             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
          Issue Type: Sub-task
          Components: OpenFormula
    Affects Versions: ODF 1.2
            Reporter: Eike Rathke
            Assignee: Eike Rathke
             Fix For: ODF 1.2


Broken out from OFFICE-916

PMT
- Constraints should have Nper>0 and integer
- For clarity, should specify that with PayType=1 the first payment is made on
  the same day the loan is taken out.
- The formula is unstable at very low rates. Better to use an approximation,
  but Calc at least does not do so, and will produce #VALUE! errors. Excel 97
  similarly gives #DIV/0!

Add constraints and PayType=1 definition, and a note that the formula may be unstable at very low rates.


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