diff --git a/src/main/java/jewellery/inventory/service/ProductInOrganizationService.java b/src/main/java/jewellery/inventory/service/ProductInOrganizationService.java
index e0a82833..2ce33111 100644
--- a/src/main/java/jewellery/inventory/service/ProductInOrganizationService.java
+++ b/src/main/java/jewellery/inventory/service/ProductInOrganizationService.java
@@ -14,6 +14,7 @@
 import jewellery.inventory.exception.invalid_resource_quantity.InsufficientResourceQuantityException;
 import jewellery.inventory.exception.organization.OrganizationNotOwnerException;
 import jewellery.inventory.exception.organization.ProductIsNotPartOfOrganizationException;
+import jewellery.inventory.exception.organization.UserIsNotPartOfOrganizationException;
 import jewellery.inventory.exception.product.ProductOwnerEqualsRecipientException;
 import jewellery.inventory.mapper.ProductInOrganizationMapper;
 import jewellery.inventory.model.*;
@@ -77,6 +78,7 @@ public ProductsInOrganizationResponseDto updateProduct(
 
     organizationService.validateCurrentUserPermission(
         organization, OrganizationPermission.EDIT_PRODUCT);
+    validateUsersAreMembersOfOrganization(organization, productService.getAuthors(productRequestDto));
 
     Product product = productService.getProduct(productId);
     throwExceptionIfOrganizationNotOwner(organization.getId(), product);
@@ -98,6 +100,7 @@ public ProductsInOrganizationResponseDto createProductInOrganization(
 
     organizationService.validateCurrentUserPermission(
         organization, OrganizationPermission.CREATE_PRODUCT);
+    validateUsersAreMembersOfOrganization(organization, productService.getAuthors(productRequestDto));
 
     Product product = persistProductWithoutResourcesAndProducts(productRequestDto, organization);
 
@@ -168,6 +171,21 @@ private void setProductFields(
     logger.debug("Product fields have been set successfully for product: {}", product);
   }
 
+  private void validateUsersAreMembersOfOrganization(Organization organization, List<User> authors) {
+    for (User author : authors) {
+      boolean isUserInOrganization = false;
+      for (UserInOrganization userInOrganization : organization.getUsersInOrganization()) {
+        if (userInOrganization.getUser().getId().equals(author.getId())) {
+          isUserInOrganization = true;
+          break;
+        }
+      }
+      if (!isUserInOrganization) {
+        throw new UserIsNotPartOfOrganizationException(author.getId(), organization.getId());
+      }
+    }
+  }
+
   private void addProductsContentToProduct(ProductRequestDto productRequestDto, Product product) {
     if (productRequestDto.getProductsContent() != null) {
       product.setProductsContent(
@@ -335,7 +353,8 @@ private void updateProductOrganizationRecursively(Product product, Organization
     }
   }
 
-  private static void throwExceptionIfProductOrganizationEqualsRecipient(UUID recipientId, Product product) {
+  private static void throwExceptionIfProductOrganizationEqualsRecipient(
+      UUID recipientId, Product product) {
     if (product.getOrganization().getId().equals(recipientId)) {
       throw new ProductOwnerEqualsRecipientException(product.getOrganization().getId());
     }
diff --git a/src/test/java/jewellery/inventory/integration/ProductInOrganizationCrudIntegrationTest.java b/src/test/java/jewellery/inventory/integration/ProductInOrganizationCrudIntegrationTest.java
index 62bf9bc9..b02a76f6 100644
--- a/src/test/java/jewellery/inventory/integration/ProductInOrganizationCrudIntegrationTest.java
+++ b/src/test/java/jewellery/inventory/integration/ProductInOrganizationCrudIntegrationTest.java
@@ -1,12 +1,12 @@
 package jewellery.inventory.integration;
 
+import static jewellery.inventory.helper.OrganizationTestHelper.getTestUserInOrganizationRequest;
 import static jewellery.inventory.helper.ResourceTestHelper.getPearlRequestDto;
 import static jewellery.inventory.helper.SystemEventTestHelper.getCreateOrDeleteEventPayload;
 import static jewellery.inventory.helper.SystemEventTestHelper.getUpdateEventPayload;
 import static jewellery.inventory.model.EventType.*;
 import static jewellery.inventory.utils.BigDecimalUtil.getBigDecimal;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.*;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import java.math.BigDecimal;
@@ -20,7 +20,6 @@
 import jewellery.inventory.dto.response.*;
 import jewellery.inventory.dto.response.resource.ResourceResponseDto;
 import jewellery.inventory.helper.*;
-import jewellery.inventory.model.Organization;
 import jewellery.inventory.model.User;
 import jewellery.inventory.model.resource.PreciousStone;
 import org.jetbrains.annotations.Nullable;
@@ -59,14 +58,20 @@ private String getOrganizationProductsUrl(String organizationId) {
     return buildUrl("organizations", organizationId, "products");
   }
 
+  private String getOrganizationUsersUrl(UUID organizationId) {
+    return "/organizations/" + organizationId + "/users";
+  }
+
   private PreciousStone preciousStone;
   private ProductRequestDto productRequestDto;
   private OrganizationResponseDto organization;
+  private UserInOrganizationRequestDto userInOrganizationRequestDto;
 
   @BeforeEach
   void setUp() {
     User user = createUserInDatabase(UserTestHelper.createTestUserRequest());
     organization = createOrganization();
+    userInOrganizationRequestDto = getTestUserInOrganizationRequest(user.getId());
     preciousStone = createPreciousStoneInDatabase();
     productRequestDto =
         ProductTestHelper.getProductRequestDtoForOrganization(
@@ -90,6 +95,7 @@ void getAllProductsFromOrganizationSuccessfully() {
   @Test
   void createProductInOrganizationSuccessfully() throws JsonProcessingException {
     OrganizationResponseDto organizationResponseDto = createOrganization();
+    addUserInOrganization(organizationResponseDto.getId(), userInOrganizationRequestDto);
     ResourceResponseDto resourceResponse = sendCreateResourceRequest();
     ResourceInOrganizationRequestDto resourceInOrganizationRequest =
         ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
@@ -118,9 +124,35 @@ void createProductInOrganizationSuccessfully() throws JsonProcessingException {
     assertProductsInOrganizationSize(organizationResponseDto.getId().toString(), 1);
   }
 
+  @Test
+  void createProductInOrganizationThrowUserNotPartOfOrganization() {
+    OrganizationResponseDto organizationResponseDto = createOrganization();
+    ResourceResponseDto resourceResponse = sendCreateResourceRequest();
+    ResourceInOrganizationRequestDto resourceInOrganizationRequest =
+        ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
+            organizationResponseDto.getId(),
+            resourceResponse.getId(),
+            RESOURCE_QUANTITY,
+            RESOURCE_PRICE);
+    ResponseEntity<ResourcesInOrganizationResponseDto> resource =
+        sendResourceToOrganization(resourceInOrganizationRequest);
+    assertProductsInOrganizationSize(organizationResponseDto.getId().toString(), 0);
+
+    ResponseEntity<ProductsInOrganizationResponseDto> productInOrganizationResponse =
+        createProduct(
+            setOwnerAndResourceToProductRequest(
+                productRequestDto,
+                organizationResponseDto.getId(),
+                resourceResponse.getId(),
+                RESOURCE_QUANTITY));
+
+    assertEquals(HttpStatus.CONFLICT, productInOrganizationResponse.getStatusCode());
+  }
+
   @Test
   void updateProductInOrganizationSuccessfully() throws JsonProcessingException {
     OrganizationResponseDto organizationResponseDto = createOrganization();
+    addUserInOrganization(organizationResponseDto.getId(), userInOrganizationRequestDto);
     ResourceResponseDto resourceResponse = sendCreateResourceRequest();
     ResourceInOrganizationRequestDto resourceInOrganizationRequest =
         ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
@@ -155,8 +187,43 @@ void updateProductInOrganizationSuccessfully() throws JsonProcessingException {
     assertProductsInOrganizationSize(organizationResponseDto.getId().toString(), 1);
   }
 
+  @Test
+  void updateProductInOrganizationThrowUserIsNotPartOfOrganization() {
+    OrganizationResponseDto organizationResponseDto = createOrganization();
+    addUserInOrganization(organizationResponseDto.getId(), userInOrganizationRequestDto);
+    ResourceResponseDto resourceResponse = sendCreateResourceRequest();
+    ResourceInOrganizationRequestDto resourceInOrganizationRequest =
+        ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
+            organizationResponseDto.getId(),
+            resourceResponse.getId(),
+            RESOURCE_QUANTITY,
+            RESOURCE_PRICE);
+    ResponseEntity<ResourcesInOrganizationResponseDto> resource =
+        sendResourceToOrganization(resourceInOrganizationRequest);
+    ResponseEntity<ResourcesInOrganizationResponseDto> resource2 =
+        sendResourceToOrganization(resourceInOrganizationRequest);
+    ResponseEntity<ProductsInOrganizationResponseDto> productInOrganizationResponse =
+        createProduct(
+            setOwnerAndResourceToProductRequest(
+                productRequestDto,
+                organizationResponseDto.getId(),
+                resourceResponse.getId(),
+                RESOURCE_QUANTITY));
+    productRequestDto.setAuthors(List.of());
+   User newUser = createUserInDatabase(UserTestHelper.createDifferentUserRequest());
+   productRequestDto.setAuthors(List.of(newUser.getId()));
+
+    ResponseEntity<ProductsInOrganizationResponseDto> updatedProductInOrganizationResponse =
+        updateProduct(
+            productRequestDto,
+            productInOrganizationResponse.getBody().getProducts().get(0).getId().toString());
+
+    assertEquals(HttpStatus.CONFLICT, updatedProductInOrganizationResponse.getStatusCode());
+  }
+
   @Test
   void deleteProductInOrganizationSuccessfully() throws JsonProcessingException {
+    addUserInOrganization(organization.getId(), userInOrganizationRequestDto);
     sendResourceToOrganization(
         ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
             organization.getId(), preciousStone.getId(), RESOURCE_QUANTITY, RESOURCE_PRICE));
@@ -184,6 +251,7 @@ void deleteProductInOrganizationSuccessfully() throws JsonProcessingException {
 
   @Test
   void transferProductSuccessfully() throws JsonProcessingException {
+    addUserInOrganization(organization.getId(), userInOrganizationRequestDto);
     sendResourceToOrganization(
             ResourceInOrganizationTestHelper.createResourceInOrganizationRequestDto(
                     organization.getId(), preciousStone.getId(), RESOURCE_QUANTITY, RESOURCE_PRICE));
@@ -301,6 +369,16 @@ private User createUserInDatabase(UserRequestDto userRequestDto) {
     return createUser.getBody();
   }
 
+  @Nullable
+  private void addUserInOrganization(UUID organizationID, UserInOrganizationRequestDto requestDto) {
+    ResponseEntity<OrganizationSingleMemberResponseDto> addUserInOrganization =
+        this.testRestTemplate.postForEntity(
+            getOrganizationUsersUrl(organizationID),
+            requestDto,
+            OrganizationSingleMemberResponseDto.class);
+    assertEquals(HttpStatus.CREATED, addUserInOrganization.getStatusCode());
+  }
+
   private ProductRequestDto setOwnerAndResourceToProductRequest(
       ProductRequestDto productRequestDto,
       UUID organizationId,