mod

When modifying recurring components, this parameter specifies whether to apply the changes to one or more instances of the event or todo. The following settings are mapped, but currently only the values 1 and 4 are honored. If 2 or 3 are specified, in certain cases they are mapped to 4.

When creating or modifying a recurring component, if changing rrules is allowed (rchange is set to 1), the system assumes a setting of 4, which causes the entire series of events or todos to be deleted and rewritten. If 2 or 3 are specified when trying to change rules or start times, they are mapped to 4. If 2 or 3 is specified for changing a summary or description, the setting are honored, but no exceptions are created for errors.