EXPERT RESPONSE
There is no direct finance function available; however, calculating internal rate of return (IRR) is done by discounting the future cash flow by a the possible inflation rate. It is a discounted cash flow technique and essentially gives the present value of future returns on the current investment.
My advice is check the interest rates functions currently available in the SAP CRM Leasing and Asset Management module. See if the reverse of interest rate calculations would give you discounted cash flows to arrive at IRR. Otherwise, you'd have to develop the functionality for an IRR calculator, as there is no out-of-box function module to support IRR.
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