The latest version of CTT3.0 is V109 issued on 6th November 2017.
The latest version of CTT3.1 is V107 issued on 23rd October 2018.
The latest version of the Object definitions file is V3.3 issued on 1st June 2018.
The Certification serves as documentary evidence of what has been tested under what conditions. For this reason a Certification, once issued, cannot be withdrawn, changed or replaced. If the data are incorrect or have to be changed for any reason, the test session(s) have to be run again and a new Certification application is needed.
It is the responsibility of the manufacturer to initiate a new conformance assessment and certification process when the meter type and the firmware determining the DLMS/COSEM features supported is changed. This applies also in the case when the firmware is updated in the field.
If an IUT exactly of the same type and DLMS/COSEM features is re-tested with a new version of the CTT, a new Certification will be issued, with reference to the earlier Certification.
However, often the reason to re-test is that the IUT supports additional or different testable DLMS/COSEM features.
This should be reflected then in the meter type / firmware version and shall lead to a new Certification
In the case when the name of a manufacturer changes, it is up to the manufacturer to inform its customers about the Certifications assigned to its predecessor(s) that should be considered by them as valid for the new company name.