http://www.petspecialties.net/ourhegu.html
Reimbursement will be made, beginning with the last scheduled payment and working backwards.

http://www.jstor.org/pss/2631855
starting from the last dividend payment and working backwards

http://www.math.hawaii.edu/~hile/math100/conse.htm
In calculating the value of the annuity on its expiration day, it is perhaps easier to begin with the last payment and work backwards




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Note added at 1 hr (2010-11-05 19:08:15 GMT)
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Looking at the text "podrán anticipar los pagos", I'm even more convinced. Forget the "scheduled" bit, which you wouldn't need. See these examples of real estate sales:

http://itunes.apple.com/us/app/simple-loan-calculator-premiu...
so I can pick my monthly payment and work backwards

http://forums.wakeboarder.com/viewtopic.php?p=1212887&sid=75...
A good realtor and Loan consultant will take that number (payment) and work backwards for you, factoring in taxes of where you want to be

http://www.obsidianrealty.com/main/Default.aspx?tabid=54
He/she will examine your debt/income ratio to assess your monthly mortgage payment and work backwards to determine how much you can afford to spend on a house.

http://www.niagarahomes.com/buyers/step1-1.php
you start from the payment and work backwards to establish the home price that best fits your wishes