I am using P6 release 7 and having a problem with Early Start and Early Finish Dates for completed activities. For example, for an activity "A" the actual start date is 10-Oct-2013 and actual finish date is 19-Oct-2013, and activity is 100% completed but somehow P6 showing me the Early Start Date 02-Nov-2013 and Early Finish Date 02-Nov-2013. To me early start and early finish dates should not really be a matter for completed activities but I like to know why and how P6 calculates early start and finish dates for completed activities. Please let me know if somebody has an answer.
Does this activity have a resource assigned? If so, check if the resource is closed (expended) otherwise it may continue to reflect future possible progress based on unused resources.