How to send notification to Buyer when acknowledgement was accepted or rejected?

Summary:

How to send notification to Buyer when acknowledgement was accepted or rejected?

Content (please ensure you mask any confidential information):

Hi

We need to enable a notification that is sent to the buyer when the supplier accepts or rejects the purchase order acknowledgment.

The documentation indicates that the "Acknowledgment Rejected Fyi" task must be enabled in BPM; however, the rules are not being enabled. How should I configure it?

As can be seen in the following image, the rulers option is not enabled, or should it be configured differently?

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

26B