PurchaseOrderERPRequest SRM -> ECC connection via PI

We are replicating purchase orders from SRM to ECC via PI,  We have downloaded the standard content to PI and configured to send as proxy on interface PurchaseOrderERPRequest_In_v1.

The message is passed via PI okay, but requires an implentation for the Proxy interface in ECC.

Should this be brought down with the standard content ?

Do we need to import something into ECC ?

Thanks

Paul