Adjustments on supplier invoice tax lines in project costing

When We are trying to transfer invoice expenses from project-a to project-b, tax lines are not transfered? Tax lines are still showing up with project-a.

I know how this process behaves in 11i but not sure in r12 as we are no more interfacing the supplier invoice adjustment costs to AP.

1. In Oracle Project Costing R12, can we perform adjustments on supplier invoice tax lines?

2. In Oracle Project Costing R12, when we perform adjustments on supplier invoice cost, what will happen to non-recoverable tax lines?