Is expense expiry period also counted as a policy violation?

Yes, the expense expiry date is considered as a policy violation.

To set up expense expiry date:

1. Switch to Admin View.
2. Click the Gear icon on the top right side of the page.
3. Go to Modules under Customization.
4. Click Expenses.
5. Under the Preferences tab.
6. Check the expense expiry date option and specify the expiry period before which the expenses will have to be submitted and approved.
7. Click Save.