Path to script generating monthly payments report (PDF)

Dear all,

I would like to adapt the pdf layout for the monthly payments report. Invoices > Payments > Reports

I checked compta/paiement/class however I do not find the pdf module?

Where is this located?

Thanks for your help.
Chris.

You find it here:

 *	\file       htdocs/core/modules/rapport/pdf_paiement.class.php
 *	\ingroup    banque
 *	\brief      File to build payment reports