Function pallet_xcm::ensure_xcm

pub fn ensure_xcm<OuterOrigin>(
    o: OuterOrigin
) -> Result<MultiLocation, BadOrigin> where
    OuterOrigin: Into<Result<Origin, OuterOrigin>>, 

Ensure that the origin o represents an XCM (Transact) origin.

Returns Ok with the location of the XCM sender or an Err otherwise.