SAP Adapter (of Oracle AS Adapters 10.1.2.0.0) can't talk to BPEL for outcome from SAP (see my note in Adapters forum: SAP Adapter Installation
So you'll need to use InterConnect.
Or there is another way.
Write your own BAPI in SAP that check if there is new information in SAP to publish to BPEL and if there is some new information, return arrays of information as out parameters.
Such BAPI you can periodically call from BPEL.
If there'll be any new information to get from SAP, you'll get it in out parameter