Try it without enter preview mode. In preview mode, go to record/request/page takes you to the next page instead of to the next record.
You can probably also do a single save as PDF with the records being browsed option and not need the loop.
Thanks for this option,
however when i do what you request I got a weird resullt.... and my invoices get all mixed up...
Anyother options there?
Which suggestion produced the "weird result"?
And what was that weird result?