There is a OOB ACL which retricts any status changes once it moves to Closed.You have to disable that ACL to reopen task,else OOB its not possible.
can you provide me with the name of the active link in order to have the ability to reopen closed tasks
so how many tasks do you have and the task which you want to open up is in which sequence?...coz if there are say 4 tasks Task 1, Task 2, Task 3 and Task 4.
If you have closed till Task 3, now Task 4 is in Active Mode and say if you try to open up Task 2 ...then once the Task 2 is closed system tries to activate the next Task which is Task 3....
fyi....so if you are opening up a Task in between it may affect the flow of Task Activation.
Another option is you would write Escalation or Filter to re-open the task.
Please share the results if you still face the problems.
Yes i agree to the Cardo's point,but how many task are get closed and have to revert back?