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CC2530: Coordinator not retaining the PAN id

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

Our application includes a coordinator and several routers

To enable large no. of routers to form network efficiently we have implemented the concentrator mode.
Changes are done based on the following TI Document.

AN123 – Breaking the 400-Node ZigBee® Network Barrier
With TI’s ZigBee SoC and Z-Stack™ Software - http://www.ti.com/lit/an/swra427c/swra427c.pdf

It was working fine before making these changes. Now Changes are made both for the coordinator as well as router. 

Objective: the coordinator should starts the network on preset pan id and channel id

Issue:

case 1:
However in the absence of routers or presence of router(with the concentrator mode changes) works fine.

case 2:
Restarting the coordinator after making the changes to the coordinator in the presence of router(without concentrator mode changes)
causes the coordinator to form the network using new pan_id.

FYI: we have used zstack core version : 2.6.1

I would like to know if there is anything wrong with this? If no, what are the conditions that should be met so that the coordinator retains the pan id?