Missing task items in UWL for substitution action

Dear all,

As per my requirement, I want to get all the task items in the UWL without using this substituted user selector buttons .When i off the "displayed substituted user selector" in the portal, i can not get all the task items in the task list. if i on the "displayed substituted user selector" , i can get all the task items in the tasks list.  Facing this problem after upgrading the version from EHP 4 to EHP7.0.

Please help me to resolve this problem.

Thanks.