User decision inside a loop where the workflow should not complete on rejection

Hi  All,

I have  the below scenario.

I am using a user decision  step inside a loop which will run n number of times. My user decision step will have 3 outcomes -

1.  Approve

2. Reject to person X

3. Reject to person Y

Basically on rejection a work item will be sent to person x  or Y. When the person x/y receives the workitem , on clicking on the workitem a pop up window should open where user can enter the details ( same as the rejection reason pop up). After this the work item should go to the user who has earlier rejected it.

Please guide me here. How should I proceed here ??

Regards

Meenakshi