PPPOE over PPTP BCP

hello all..

i have debate with my friend..he is a trainer also.. i want to ask to you everyone here.. is it true PPPOE over PPTP BCP
my answer is TRUE.. i have been found MTU 1430 but i choose in bridge interface, I was try again but that give different MTU again ( confused :confused: ) and my friend say FALSE.. because you choose interface bridge and PPTP interface not in list there..

I need explaination
Thanks

Teddy Yuliswar