Retrieve child activity records using EAI Adapter BS

Hi,

We would like to impose My Team's visibility using viewmode property on Activity entity using EAI Adapter Business Service. However the request will be received from Portal to Siebel using a Web Service call by passing Manager's position.

We want to retrieve all the child records for My Team's activity. The issue is: EAI Siebel Adapter will use active position of 'EAI_ADMIN' user and hence the desired results are not achieved.

Please suggest how can we retrieve all the child records for activity linked to Manager's position.

Thanks,

Snehanjan