Component/s: AS4 Profile
Section 220.127.116.11 indicates that support is required for
However, these errors appear to only relate to Reliability. Ie. bullet point 'PMode.ErrorHandling.Report.DeliveryFailuresNotifyProducer' of section D.3.4 of the core spec states the following
This assumes that Reliability.AtLeastOnce.Contract is "true".
And Section 18.104.22.168 of the AS4 Profile states that support is not required for PMode.Reliability