Interface Analysis

Dear Friends,

I need some clarity with one interface which i put with you people as a points as follows:

Systems:

1. I have 2 boxes in my Interface Consists of: SAP ECC(6.0) & METASTORM(Microsoft Workflow system).

2.When a metastorm sending a Webservice to PI.PI need to send this to SAP ecc system.

3. Message travelling from metastorm to sap ecc system is sysnchronous.

Kindly update how this webservice should we handle in PI.

In Integration Directory: can we see the already defined webservices.

I hope mostly we will be using server proxies to connect sap ecc system