Action History not showing for Approved PO using Import Standard Purchase Orders

Hi,

We are able to created Approved PO and able to receive. But when we try to check the Action history its not showing any thing.  Usually when we create PO manually the action history will be SUBMIT and APPROVE but for import PO's not showing below error when i try to view action history from PO summary form

APP-PO-14288: This document is either incomplete or you do not have access to it or there is no action history.

Please advise,

Regards,

Raj.