Data Discrepancy in View

Dear Concern,

There is a view named PS_VCHR_PO_HDR_VW in PeopleSoft FSCM. There are 6 purchase orders which are not show in this view. But when I open SQL Query of that view and run the same all 6 purchase orders are present there. How it is possible that View is returning different results and its query return different results. And the view is the prompt table of PO_ID field in Regular Entry page.