@Joel Fernandez Thanks for sharing the screenshot. In that case the connector action doesn't support updating the PurchaseOrderStatus as the property is not exposed by the connector action. Let me double check on this with the team as this would be feature request for the connector in case if it is not supported.
I have got the confirmation that this is not supported in the connector right now. Feel free to create the feature request here if this is something you would like to see in the logic app connector.