Transfer attachments from MM to SUS

Dear experts,

We are on SRM 7.01 and ECC 6.04 with PI Integration

We have set up MM-SUS (Service Scenario)

We would like to send attachments from ECC to SRM-SUS.

These attachments are set on header level when creating the PO.

These attachments are not included in the XML file.

What are the configurations steps required to transfer these attachments to SRM-SUS