[trunk][procurement] Cancel Picking then PO leaves Procurement Running

If you cancel the pickings (receptions) for a PO attached to a Procurement Order and then cancel the PO itself, the Procurement Order is left running. It should be cancelled.

Steps to recreate:
 1. Create Procurement
 2. Confirm Procurement
 3. Open PO -> click convert to PO
 4. Goto Receptions
 5. Cancel Picking -> note that PO is in 'Shipping Exception'
 6. Cancel PO -> note that Procurement is still 'Running'

I haven't looked at the workflow fully but I'd assume that 'Shipping Exception' isn't handled properly by the sub-workflow, so it never handles the cancel back from the PO properly.