Who approves transaction completion when user who approves is on leave?

Summary:

We have configured transaction completion control for Manual Invoices and Credit Memos. We have used user-based approval controls. When the approver is on leave, is there a vacation rule that will work with this similar to BPM vacation rules? Also is there a mechanism in place to prohibit self approval for these so an approver cannot approve their own manually created Invoice and Credit Memo.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):