Template PDF for One to Many Relationship

Hi,

With Product/Services Line Itens the PDF generate works in relationship Proposal -* Line Itens. Print all itens.

I have an one to many relationship (Proposal to Invoice, i.e)

I would like to build a PDF template for Proposal that list all Invoices related.

i.e.:

Proposal #: 987

Invoices:

Due Date Value $
01/01/2016 1.000,00
01/02/2016 1.000,00
01/03/2016 1.000,00

But this relationship (or another # Line Itens) did not work.

Is there a way to do its works?

Thanks!