Originally Posted by
jareczek
May I ask what rules? I was searching for E-Voucher rules, but except simple rules like 1 voucher for continental, 2 vouchers for intercontinental upgrade one way I couldn't find any other rules (hence my question here).
Upgrading from Y to C using PPB points will book you in fare class I, which is the same as for Biz class awards, and these can not be upgraded using e-vouchers.
You will get miles in your original booking class.