Create Expense Report/Items using SOAP Webservice

Summary

Create Expense Report/Items using SOAP Webservice

Content

Hello,

We are using Create Expense Report web service to create the Expense Report and Items. Is it possible to create expense impersonating the user using web service? OR In general, not specially for Expense report how we can impersonate the user using the web service.?

Currently in authentication under Payload header uses the generic account credentials however we would like to have expense to be created by the user for whom the expense is being created by the web service. Any pointer are highly appreciated.

We are using below SOAP WSDL