Object1->Unlink(Relation, Id2) doesn't work, if primary key order in table of m2m reference isnt 1:Object 2: Id to unlink, when relation set to EQUAL= TRUE

User:
  actAs: 
    Timestampable: ~
  columns:    
    name:         { type: string(255), notnull: false }
    last_name:    { type: string(255), notnull: false }
    picture:      { type: string(255), notnull: false }
    birthday:     { type: timestamp, notnull: false }
    gender:       { type: string(255) }
    rating:       { type: integer, default:0} 
    num_comments: { type: integer, default:0} 
    num_groups:   { type: integer, default:0} 
  inheritance:
    extends: Member
    type: column_aggregation
    keyField: type
    keyValue: 1                    
  relations:
    Friends:    { onDelete: CASCADE, class: User, foreignAlias: Friends, refClass: FriendReference, local: user1, foreign: user2, equal: true }
    Request:    { onDelete: CASCADE, class: User, foreignAlias: Pending, refClass: PendingReference, local: user1, foreign: user2 }
    Blocker:    { onDelete: CASCADE, class: User, foreignAlias: Blocked, refClass: BlockedReference, local: user1, foreign: user2 }

 
			if(isset($refToRemove))
			{
				switch ($refToRemove)
				{
					case 'FriendReference': $references = $currentUser->Friends; $relation = 'Friends';	break;
					case 'PendingReference': $references = $currentUser->Pending; $relation = 'Pending'; break;
					case 'BlockerReference': $references = $currentUser->Blocker; $relation = 'Blocker'; break;
					case 'RequestReference': $references = $currentUser->Request; $relation = 'Request'; break;
				}
				 
				foreach($references as $reference)
				{

					if ($reference->id == $user2->id)
                        $currentUser->unlink($relation, array($user2->id), $now = true);
				}
                
			}