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Event object - FIELD_INTEGRITY_EXCEPTION when attempting update.

When attempting an update on the Event object the API returns errors:
Error message = reassignDisallowed: Owner

I'm simply trying to update the OwnerId field on an Event object using the Java API.

I also get an error when I try to make this update via the Excel Connector, so it seems that there is a fundamental issue going on here. Furthermore, I did not get this error from the same code in the same circumstances before the new SFDC release that just launched.

Can anyone tell me why owner reassignment would be disallowed for an Event? The same owner id can be reassigned as owner of a contact record, so I know that there is nothing fundamental on the user record (like being inactive) preventing reassignment.

Has anyone come up with an answer to this question?  I too can not reassign Event ownership and get the same error.

Same issue here - why can't we reassign an event?  Very frustrating