Plant to project stock

Hi Experts,

Whats the right movement type to transfer Material from Plant stock to Project sock in case of non valuated project stock? Is it 412Q or 415?

Incase of Movement type 415, I get a error message : Message no. KI249 : Enter only one true account assignment.

However when I use 412Q for the same PLant, material & project, the transfer happens as expected.

Basically I want to know the difference between these movement types and their implications.

Thanks

Sejo