SUS Confirmation not replicate back to SAP ECC

Hi Experts,

I have an issue in replicate confirmation from SUS to SAP ECC.

The system landscape as below

SAP ECC connect to SRM, SRM connect to SUS

My issue is:

When vendor create confirmation from SUS, the confirmation transfer back to SRM successfully

After the user approve the confirmation, the confirmation is not replicate back to SAP ECC.

However, if i create the confirmation from SRM, the confirmation is replicate back to SAP ECC.

The status in BBP_PD as below:

Confirmation from SUS

Confirmation from SRM

My question is how to replicate the confirmation created in SUS replicate back to SAP ECC?

Thank you

Regards,

Mike