Multiple idocs into Single EDI Data

Hi Experts,

There is a requirement to create multiple invoice idocs in one single edi file.

Flow:

Invoices trigger from R/3 system to PI system. PI system should be able create a single edi file to send the business partner.

PI system is SAP PI 7.4 with SP09 with B2B Add-on 4.

Kindly guide me to achieve this.

Thanks in advance.

Regards,

Srinivas