Can't change content item to Expired status when an approval definition exists

Description

Steps to reproduce:
1. Select a published page
2. Enable and define Content Approval Sequence on the page
3. Open the Manage Expiration and Archiving dialog
4. Select an expiration date (e.g. click Now link) then click Save button

Expected: Published version is changed to Expired status and warning message is displayed on notification bar.
Actual: The page's version status is not changed (after reloading the page, warning message is disappeared from notification bar and expiration setting is removed.
Note: No such issue if Content Approval Sequence is disabled.