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I would like to be able to print a report for a customer with all invoices with the 'open' state.
I'd print those if one invoice is overdue, with a generic text, company header and send them to the customer.
At the bottom they would then see not only the overdue invoice, but all open invoices.
I have edited my invoice etc so I know how to do some editing, but I don't know how to get started on this entirely new report...
Have you tried the Overdue Payments report that is available from the Customer? Open the customer form and click the Print button, then select Overdue Payments. This report will display all open invoices, due or not due.
For inspiration, you could look at the account_followup module from the default modules. this provides you with something similair I suppose.
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