How to reject invoices automatically when the invoice creator/submitter is the same as the approver?

Summary:

How to use Prohibit User Self-Approval and auto-reject invoices when the invoice creator is the first approver in the approval flow?

Content (please ensure you mask any confidential information):

Hello,

We followed note How to Prohibit Self-approval For Invoice Creator? (Doc ID 2946180.1) and we configured the Prohibit Self-Approval functionality, for the following 2 users:

First value should be: /task:task/task:creator

Second value should be: /task:task/task:payload/ns2:findInvoiceHeader1Response/ns2:result/ns1:Value/ns1:CreatedBy

Now, we want to know how can we configure the setup so that the invoice gets rejected when one of the above conditions is met.