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in reply to Reverse engineering a formula...
If you could provide the values for each of the fields that are associated with the $843.24 payoff amount, that would be helpful. The values that you would see in a lease calculation
would typically include the original price of the item, the residual value, the interest rate, the lease term, and perhaps the monthly payment. The range of values for each of those value types can be constrained rather easily. Obviously, the interest rate is going to be a number somewhere between 5 and maybe 30 percent at the outside. The lease term will be either in months or years most likely, so you know that that is going to be a small integer.
Your problem here is one of a type that always makes my blood boil when I hear about them. Regardless of whether a system is proprietary or not, a user ought to be able to retrieve in a simple fashion every piece of data that has been put into the systems. So many of the big name ERP systems make it really easy to put a lot of data in, but then they want to charge you big bucks for "reporting tools" just so you can see what's actually in the system. Every single table should be able to be dumped as a text file or CSV file or something. That's my rant for the day:)
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