How to include the substitute information in the Receipt Traveler Report?

Hello,

How to modify the "Receipt Traveler" report to include a new field to show if an item was received as a substitute?

For example I am receiving ItemA which can be substituted for ItemB. During reception I change ItemA for ItemB and receive the PO.

When I generate the "Receipt Traveler" I want to have a field to show that I received ItemB, and another field to show that this ItemB was a substitute for ItemA (The PO originally had ItemA in the line).

Thank you,

Artiom