Persisting an entity with an 1:n collection of related entites fails if the FK ist part of a composite PK

EntityA:
  type: entity
  table: entity_a
  repositoryClass: EntityARepository
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    handle:
      type: string
      length: 32
      unique: true
 oneToMany:
    entites_b:
      targetEntity: EntityB
      mappedBy: entity_a
      cascade: [persist]

EntityB:
  type: entity
  table: entity_b
  repositoryClass: EntityBRepository
  id:
    description:
      type: string
      length: 255
      notnull: true
      generator:
        strategy: NONE
    entitiy_a_id:
      type: integer
      length: 11
      notnull: true
      generator:
        strategy: NONE
  fields:
    value:
      type: string
      length: 255
  manyToOne:
    entitiy_a:
      targetEntity: EntitiyA
      inversedBy: entities_b

Class EntityA
{
    private $id;
    
    private $handle;
    
    private $b_coll;
    
    public function addB(EntityB $ent) 
    {
        $this->b_coll->add($ent);
        $b->setA($this);
    }
}

Class EntityB
{
    private $description;
    private $entity_a_id;
    
    private $value;
    
    private $entity_a;
    
    public function setA(EntityA $ent)
    {
        $this->entity_a = $ent;
    }
}