Expenses prorated to the credit card and forecasting future revenues and expenses

[José Romildo Malaquias]

I would like to use GnuCash for registration and control of my home
finances. But I'm having a hard time planning the launch of installment
purchases on credit cards.

I would like to be able to check the future transactions according to
the installments. It could be a report consisting of expenditure and
revenue provided on a monthly basis within a specified period (in the
future). For instance, I would like to know what will be the expected
revenue and expenditures in December 2011, and January and February
2012.

Let's say that in 13/dez/2011 I make a purchase of a unit at the cost of
$1000 using the credit card payment installments (without interest) to
be paid in 4 installments of $250. The card bill has to be paid on every
15th day, and the its invoice is closed 10 days in advance (ie on
5th). So these installments will appear on the invoices for the 15th day
of January, February, March and April. Note that if the purchase was
made on the dez/04/2011, the installments would appear in the invoices
for December, January, February and March.

How to deal with this transactions in GnuCash so that:

* the date of purchase is preserved

* it is possible to issue a report on future transactions, consisting
  that in January I have to pay the first installment in February the,
  and so on

Any tips?

Romildo