Form Personalization on PO Approval Screen

Hi Oracle Community, we're using Oracle E-Business Suite ver 12.2.5 and I doing some Form Personalization to force all expense PO to go through a fixed Approval Path so that our top management level will approve the expense PO separately from our Standard PO approval path. I am able to force it through the correct path, however upon clicking the Submit approval button, the Approval Path and Forward To text box will suddenly be cleared off and the submitted PO will be returned to unapproved state with error "No Approval Path Found" in the Workflow. Can somebody assist me on