I got this error when I try to save an approvement(which has variables : products, name_client and number) to the database

A new entity was found through the relationship ‘AppEntityApprovement#products’ that was not configured to cascade persist operations for entity: telephone samsung. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={“persist”}).

this is my Approvement Entity

<?php

namespace AppEntity;

use AppRepositoryApprovementRepository;
use DoctrineCommonCollectionsArrayCollection;
use DoctrineCommonCollectionsCollection;
use DoctrineORMMapping as ORM;

#[ORMEntity(repositoryClass: ApprovementRepository::class)]
class Approvement
{
    #[ORMId]
    #[ORMGeneratedValue]
    #[ORMColumn]
    private ?int $id = null;

    /**
     * @var Collection<int, Product>
     */
    #[ORMOneToMany(targetEntity: Product::class, mappedBy: 'approvement')]
    private Collection $products;

    /**
     * @ORMColumn(type="string", length=255, nullable=true) 
     */
    
    private ?string $name_client = null;

    /**
     * @ORMColumn(type="integer", nullable=true) 
     */
    private ?int $number = null;

    public function __construct()
    {
        $this->products = new ArrayCollection();
    }

    public function getId(): ?int
    {
        return $this->id;
    }

    /**
     * @return Collection<int, Product>
     */
    public function getProducts(): Collection
    {
        return $this->products;
    }

    public function addProduct(Product $product): static
    {
        if (!$this->products->contains($product)) {
            $this->products->add($product);
            $product->setApprovement($this);
        }

        return $this;
    }

    public function removeProduct(Product $product): static
    {
        if ($this->products->removeElement($product)) {
            // set the owning side to null (unless already changed)
            if ($product->getApprovement() === $this) {
                $product->setApprovement(null);
            }
        }

        return $this;
    }

    public function getNameClient(): ?string
    {
        return $this->name_client;
    }

    public function setNameClient(string $name_client): static
    {
        $this->name_client = $name_client;

        return $this;
    }

    public function getNumber(): ?int
    {
        return $this->number;
    }

    public function setNumber(int $number): static
    {
        $this->number = $number;

        return $this;
    }
}

this is my Controller

<?php

namespace AppController;

use AppEntityApprovement;
use AppEntityCartItem;
use AppEntityProduct;
use AppFormAddApprovementType;
use AppRepositoryApprovementRepository;
use AppRepositoryProductRepository;
use DoctrineORMEntityManagerInterface;
use Proxies__CG__AppEntityPurchase;
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpFoundationSessionSession;
use SymfonyComponentRoutingAttributeRoute;
use SymfonyComponentHttpFoundationSessionSessionInterface;


class ApprovementController extends AbstractController
{
        #[Route('/approvements/view', name: 'view_cart')]
        public function viewCart(ApprovementRepository $approvementRepository,SessionInterface $session): Response
        {
            $panier = $session->get('panier');
            return $this->render('approvements/view.html.twig', [
                'panier'=>$panier,
            ]);
        }
        #[Route('/approvements/page', name: 'approvement_page')]
        public function Approvement(Request $request, EntityManagerInterface $entityManager, ProductRepository $productRepository, SessionInterface $session): Response
        {
            
            $approvement = new Approvement();
            $form = $this->createForm(AddApprovementType::class, $approvement);
    
            $form->handleRequest($request);
    
            if ($form->isSubmitted() && $form->isValid()) {
                
                $products = $session->get('panier');
                foreach ($products as $productValue) {
                    $productId = $productValue['id'];
                    $quantityToDecrease = $productValue['quantity'];
                    // Retrieve the product entity
                    $productEntity = $entityManager->getRepository(Product::class)->findById($productId);
                    $category = $productEntity->getCategory();
                    $description= $productEntity->getDescription();
                    $created=$productEntity->getCreatedAt();
                    $modified=$productEntity->getModifiedAt();
                    $imageName=$productEntity->getImageName();

                    if ($productEntity) {
                        // Decrease the quantity
                        $currentQuantity = $productEntity->getQte();
                        $newQuantity = $currentQuantity - $quantityToDecrease;
                
                        // Update the quantity in the entity
                        $productEntity->setQte($newQuantity);
                
                        // Persist changes
                        $entityManager->persist($productEntity);
                        $product = new Product();
                        
                        $product->setQte($newQuantity);
                        $product->setName($productValue['name']); // Set product properties as needed
                        $product->setDescription($description);
                        $product->setCreatedAt($created);
                        $product->setModifiedAt($modified);
                        $product->setCategory($category);
                        $product->setImageName($imageName);
                        $approvement->addProduct($product);
                        $entityManager->persist($approvement);

                    }
                }
                $entityManager->clear($approvement);
                $entityManager->flush();
                $session->remove('panier');
    
                return $this->redirectToRoute('app_approvements');
            }
            
            return $this->render('approvements/page_approvement.html.twig', [
                'form' => $form->createView(),
            ]);
        }
    }

Error when I tried to save an approvement to database