TANK Version 2.55 was released in October 2005. API-650 Addendum 4, while dated December 2005 (after Version 2.55 was released), was not actually shipped to anyone until May of 2006.

So therefore, TANK 2.55 does not support Addendum 4. This Addendum will be addresed in TANK Version 3.00. There is no definite release date for this version at the current time. Work is progressing on for both Appendix E and Appendix V.