Assuming your xTuple Connect Batch Manager client is running—and that you successfully added a line item to a Purchase Order—you should receive an email notifying you of that Event. The email will look like the following:
If for some reason you do not receive an email notification, check the main xTuple Connect Batch Manager screen to verify the job has been processed. It may not have been completed yet. Also check to make sure your xTuple Connect Batch Manager client is running.