Andrew - you will need to obtain the appropriate organization_id and job_id for the new position, and plug those into your api call. You should then be OK. The target date of 01/06/2010 should not be a problem, if you use that as the effective date and a date-track mode of 'UPDATE' - however you *might* hit one or two instances where the assignment has already got a date-effective change on or after that date.
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