Is there a way possible where "Received Time" can be stored at Task level. This datetime value should get updated with the current timestamp whenever "Claim" operation happens on the Task. The use case is that most of the time if its a 1 potential owner of the task - the task goes through "created/ready/reserved" status whenever a new Task gets created, in this case creation time would be same as received time — but whenever the task is assigned to group or multiple potential owner or even when it is in reserved status it can be forwarded/delegated to other user/group - then in that case whenever user receives as task or in WSHT tem claim operation happens can we store the timestamp at the task level.
Currently at task level we have creation time/activation time/expiration time ---- may be activation time can be used but i guess its use is very specific as detailed in WSHT/BPEL4People spec. In real world scenario it becomes quite important that when the user actually claimed the task or was assigned the task.