In the current WorkItem Team Area, We have 3- Level of WorkItems. The organization is:

Requirement

->Scenario

->Task

Incident walk-thru:
 
We have a Requirement1 which has a child Scenario1, the Scenario1 has child task1.
I'm trying to import new tasks from a .csv file. the new tasks that I create should be children of task1. Input file is as follows:
 

Type	Parent	Summary	Description	Owned By
Task	#1234	sample Summary	sample Desc	xyz

Where #1234 is the id of task1.

Post import, the task1 to new-task parent child relationship is created. However, this will also cause the link between Task1 and scenario1 to be broken.

This phenomenon of the grand parent link getting wiped off when establishing a new parent child relationship is evident across all levels, across WorkItem Types.

Please help.