In his response to my email, Luis says that he is aware of the problem with the cuotas, so it would appear to me that it is not as simple as substituting previously advised figures.
I do agree that it appears to be a general template with some formulae programmed into it but I believe the intention was that the attachment should relate to your apartment & you were not expected to fill in the data yourself.
Hopefully Luis will clarify tomorrow.
Regards
Noreen