CakePHP 3.0 ORM and saving associated data

I love the new ORM, but I'm having real trouble here.

I used the built-in "baking" system, to create the Controllers, Tables, Entities etc off of my database model. I want to add a new row to the "orders" table. There's one main association: Order belongsTo Call. This is what I'm trying to do to save a new Order and add a new Call at the same time:

$newOrder = $this->Orders->newEntity([
    'call' => [
        'user_id' => 1,
        'customer_id' => 1,
        'result_id' => 0
    ],
    'delivery' => 1
]);
$this->Orders->save($newOrder);

The error that I'm getting is:

Array
(
    [call_id] => Array
        (
            [0] => This field is required
        )

)

call_id is a required field, yes, but I'd like to save both of them at the same time. The documentation is rather .. not clear? Judging by this tweet it also looks like this should be possible. I already checked the $_accessible variables and they seem perfectly fine as well. Do I really have to go the long route and start chaining Entities (as described here) or can this still be done with the newEntity method? Thanks for any help in advance.

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