Is there any standard Oracle functionality to prevent AP invoices created via iExpense from being mo

Is there any standard Oracle functionality to prevent AP invoices created via iExpense from being modified in AP Invoice workbench?

When entering an iExpense report, then importing it to AP, that AP invoice can then be modified, in terms of value. Once approved, the iExpense report should not be modifiable.

This introduces a risk where either an AP clerk can modify their own expense report claims, or, collusion where the expense requestor agrees on a modification with an AP clerk for a favor in return.

I know things like forms personalizations can be added to prevent modification. My question is really about standard Oracle functionality.