Hi Hayashi,
BBPGETVD is not supported with SUS. You need to use BD14 transaction in your ECC system. If setup correctly this should trigger a Z_CREMAS_SUSMM type idoc. In the PI system this will be mapped to XML and sent to SUS via interface SupplierPortalTradingPartner_CreateOrChange_In.
You can find the configuration steps in the SRM config guide.
regards
Zoltan
