Project Manager profile on Expense Report

I am troubleshooting several transactions where expense reports were submitted for approval and the ERApproval process included the Project Manager profile but the business owner indicates no changes were made to production workflow.  We have never used the Project Manager profile. Is there a way to determine when the workflow process changes and by whom? 

What steps would i take to determine how the Project Manger profile was added to the ERApproval workflow?

This is what I see at this point

Set Up Financials/Supply Chain-->Product Related-->Expenses-->Management -->Approval Setup
Process ID ERApproval Active for Review (REVIEWER), Expense Approval(EXAPPRVER), Pre Pay Audit(PREPAYAUD)