Change E-mail Subject,Body Text,Sender Name,To mail id in Std.Script F110

Hi Experts,

I need to change Change E-mail Subject,Body Text,Sender Name,To mail id in Std.SAP Script F110 for Payment Advice.

The Path for e-mail is PERFORM AVIS->PERFORM avis_schreiben->PERFORM MAIL_PDF_ADVICE--->SO_DOCUMENT_SEND_API1

I got Enhancement points at start point of PERFORM MAIL_PDF_ADVICE.

How could i change the  required parameters to achieve my requirement ???

I am working on ECC 6.0 and SAP_APPL 605.

Pls assist .

Thanks in Advance.