How Use ExpenseApproval Webservice to Change Status of Exp Reports?

Summary

need to update EXPENSE_STATUS_CODE for several expense reports where it is NULL

Content

We have a handful of expense reports during which the creators abandoned the task before saving.  The expense report exists with all the associated expense items but since EXPENSE_STATUS_CODE field is NULL no one is able to retrieve these expense reports through the Fusion interface. 

Oracle SR tech has said "use the ExpenseApproval webservice to change the status of those two Expense Reports to SAVED that would fix the problem, currently the status is NULL (which may happen if the user used the back button while creating the ER)"