Spell problem?

[aki15]

Hello everyone i need to make mana transfer spell...
I'm using SIPHON MANA and trying to make it castable on friends...
I put targets allowed : Friend
And it says that i must cast on enemy.... ? What do to ??

 

[SamNainocard]

You have to change something in Gameplay Constants

Gameplay - Transfers Mana = true

 

[aki15]

You have to change something in Gameplay Constants

Gameplay - Transfers Mana = true

Thanks !