same relationship on multiple wizard steps

Wizard\Step::make(__('step 2'))
          ->schema([
                Forms\Components\Group::make()
                    ->relationship('article')
                    ->schema([some fileds])
            ]),
Wizard\Step::make(__('step 3'))
          ->schema([
                Forms\Components\Group::make()
                    ->relationship('article')
                    ->schema([another fields])
            ]),
...
public function submit(): void
{
    $portal = Portal::create($this->form->getState());
    $this->form->model($portal)->saveRelationships();
only step 2 is saved