An error occurred while trying to connect to the provider (UWL)

Hi Experts,

We are on SRM 7.0 SP05

We are facing issue in UWL for approvers. If I log-in as approver in EP, am getting the below message.

Warning: An error occurred while trying to connect to the provider. If I click on the details of the warning

Exception type:com.sap.netweaver.bc.uwl.connect.ConnectorException Message:Aug 18 13:28:05 BST 2010

(Connector) :com.sap.portal.connectivity.ConnectivityRuntimeException:User is missing credentials for connecting to alias SAP_SRM. Contact your system administrator.

I am not facing the above issue, If I use SAP_ALL profile to the user.....So, seems that there is some authorisation object missing for the approver role (Manager).

Please advice

Appreciate your help

BR

Siva