Thank you macropod, may be I explained less clearly my problem. If I can summarize what I want is this:

Introductory comment
Invoice 1
Invoice 2
Invoice 3

page break

Invoice 4
Invoice 5
Invoice 6

page break

Invoice 7
Invoice 8
Invoice 9

concluding comment

The problem I have is that "concluding comment" desapears when invoices are on more than one pages. Any help is welcome