The figure shows a screenshot of the Expression Builder dialog.

The Expression box contains the following line:

string(bpws:getVariableData('customerServiceResponse','parameters',
'/ns8:findCustomerByIdResponse/ns8:return/ns8:status'))

Only the followin items are shown in the BPEL Variables box:

In the Functions section, the dropdown shows "BPEL Extension Functions", and "getVariableData" is selected.

The Content Preview box contains:

bpws:getVariableData('customerServiceResponse','parameters',
'/ns8:findCustomerByIdResponse/ns8:return/ns8:status')