set_validation_data: TxDescriptor<{
    data: {
        downward_messages: {
            msg: Binary;
            sent_at: number;
        }[];
        horizontal_messages: [number, {
            data: Binary;
            sent_at: number;
        }[]][];
        relay_chain_state: Binary[];
        validation_data: {
            max_pov_size: number;
            parent_head: Binary;
            relay_parent_number: number;
            relay_parent_storage_root: FixedSizeBinary<32>;
        };
    };
}>

See [Pallet::set_validation_data].