6.1.2.

The SEQUENCE value should not be changed when the only properties that are changed are those not having to do with meeting date, time, or duration change. This refers to changing SUMMARY or LOCATION, for example. When changing these properties, it’s best not to change the SEQUENCE value if a meeting time change is not also involved in the update. The SEQUENCE value is used to denote a date, time, or duration change; not a change in other properties.