The Herbicide Resistance Action Committee (HRAC) has changed the classification of mechanisms of action for herbicides from the alphanumeric system of the HRAC to the numerical system of the Weed Science Society of America (WSSA). In the process, there have also been changes in the classification of active substances into chemical groups and/or mechanisms of action.
For the moment the database on website weedscience.org is not updated. Only the poster HRAC with the new classification is updated. It is needed to take into account this new classification. Here is a note from HRAC regarding this new classification.