The 'CMN.ATO.AS.EM92025' error occurs when there is already a lodged activity statement amendment form on the ATO portal (The same DIN has been lodged). Check the ATO portal to confirm.
The error can also occur if the Activity statement reversible status is not reversible. To check the status, go to Properties: Amendment details. Activity statement reversible status : Activity statement not reversible.
This occurs due to the amendment indicator in the payload not been activated.
we are currently investigating this issue.