How to handle Cancelled lines in invoice approval

Summary

The BPM requires some approval of the discarded lines but I don't know what to use.

Content

We are doing invoice approval based on Job Level Hierarchy and using cost centre managers .

Scenario 1 is: enter an invoice with

Line 1 assigned to accounting code xx.12345.CC1...

Line 2 assigned to accounting code xx.12345.CC2...

Invoice approvals will send the invoice for approval to managers for both CC1 and CC2.

Scenario 2 is same invoice, but then cancel line 1.  

If you look at the APList for the invoice, the Discarded Status Indicator is Y, so this looks like a good field to use for criteria.