POApvMsg Table

When or how does the POApvMsg table get updated? When I manually approve a po in the po entry form should a record be inserted?

Trying to use rest to approve purchase orders. The approvals work. But no record inserted in POApvMsg.

This is from the POApvMsg Table description:

POApvMsg : Purchase Order Approval Message queue.
This table contains three record types.1 - To notifiy the approver about PO’s which have exceed the buyers limit and need to be reviewed. 2 - Tto notify the buyer when the approver responds. 3 - To notify that the Purchase Order was manually closed.