9.1 Expense Time Report - Approvals by Project Manager

We are running 9.1 FSCM Expenses for Time Reports along with Project Costing.  Here is the issue.  I turn on Project Manager approvals for time reports rather than using HR Supervisor.  When a time report has say two lines, each with its own Project Manager and one PM approves their line of the time report, the Time Report's line status gets set to PAR - Approval In Process rather than setting the line to APR - Approved.  The line only gets officially approved APR when ALL lines by ALL Project Managers are approved.  Is there a reason for preventing the