Saving entity, with table associated to itself through join table - cakephp

Question

I'm building an App with CakePHP 3.0. I have a FactsTable and an InterferencesTable. Interferences has this fields:
[id][changed_fact_id][influenced_fact_id][trend][modified_by][modified_at][created_by][created_at]
associations look like this:
FactsTable:
`$this->belongsToMany('InfluencedFacts', [
'through' => 'Interferences',
'className' => 'Facts',
'foreignKey' => 'changed_fact_id'
]);
$this->belongsToMany('ChangedFacts', [
'through' => 'Interferences',
'className' => 'Facts',
'foreignKey' => 'influenced_fact_id'
]);`
InterferencesTable:
`$this->belongsTo('ChangedFacts', [
'className' => 'Facts',
'foreignKey' => 'influenced_fact_id',
]);
$this->belongsTo('InfluencedFacts', [
'className' => 'Facts',
'foreignKey' => 'changed_fact_id',
]);`
I baked my controllers and views. Saving a new Fact works fine but the association isn't saved. I tried to save the association manually but it doesn't work, too.
If i made a mistake in model-association, please tell me ;)
saving code from FactsController.php:
`public function add() {
$fact = $this->Facts->newEntity($this->request->data);
if ($this->request->is('post')) {
if ($this->Facts->save($fact)) {
$id = $fact->get('id');
$this->Flash->success('The fact has been saved.');
return $this->redirect(['action' => 'index']);
} else {
$this->Flash->error('The fact could not be saved. Please, try again.');
}
}
$aggregates = $this->Facts->Aggregates->find('list');
$plants = $this->Facts->Plants->find('list');
$influencedFacts = $this->Facts->InfluencedFacts->find('list');
$this->set(compact('fact', 'aggregates', 'plants', 'influencedFacts'));
}`
Fact Entity:
`protected $_accessible = [
'name' => true,
'short' => true,
'description' => true,
'modified_by' => true,
'modified_at' => true,
'created_by' => true,
'created_at' => true,
'aggregates' => true,
'plants' => true,
];`