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Where can I print a customer's list of unpaid invoices? I'm looking for the pdf document that can be sent monthly to the customer so he can see what is due and how old each invoice is.
If I understand you well, there are two ways to do so:
In Accounting/Reporting/Partners/Partners Ledger, where you can list (even separate page of each partner) all the entries (not just open ones)
Overdue Payments / Customer account payments in Accounting/Customers/Customer you choose or filter the partner(s) and after selecting it/them you can choose Print/Overdue Payments. you can do it in mass, but then it it one PDF wont't help if you want to email it. - I guess this is what you were really looking for.