A task is assigned to a group.One of the user from the group accepts the task and be idle (do nothing, performs no action).After one hour the task should be reassigned back to the group.Please help here on how to acheive this?
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as Stefan has said, there is a limitation with Appian out of the box tasks, and there is an option to potentially use "database tasks" where a data model could be used instead. This is where you write to a database table (A Record) the task details and present this to the user in an interface instead of the task list from a process.
HOWEVER!! :) ... this comes with an overhead of development time and significant testing and so on so not something I would advise unless the requirements absolutely can not be met with Appian OOB task setup.