PurchReqLine Workflow auto cancellation

Hello 

I need some customization about purchReqLine workflow process.

I use PurchReqLine workflow functionality with PurchReqTable workflow.

My problem is reject element.

When I submit a purchase requisition to wf purchase requsition line workflow hierarchy is automaticaly submitted.

if one line is rejected and other line will be approved on my requisition I want to my rejected line will be cancelled automatically and my Purch requisiton worklow should be completed. 

is it possible?

I have 3 purchReq Line and one of the line is rejected. The workflow should be finished and rejectedLine must be cancelled automatically.

thanks.