diff --git a/includes/abstracts/abstract-wc-data.php b/includes/abstracts/abstract-wc-data.php
index dfc436bd392..c2b83cde41e 100644
--- a/includes/abstracts/abstract-wc-data.php
+++ b/includes/abstracts/abstract-wc-data.php
@@ -539,11 +539,14 @@ abstract class WC_Data {
 
 	/**
 	 * When invalid data is found, throw an exception unless reading from the DB.
-	 * @param string $error_code Error code.
-	 * @param string $error_message Error message.
+	 *
 	 * @throws WC_Data_Exception
+	 * @param string $code             Error code.
+	 * @param string $message          Error message.
+	 * @param int    $http_status_code HTTP status code.
+	 * @param array  $data             Extra error data.
 	 */
-	protected function error( $error_code, $error_message ) {
-		throw new WC_Data_Exception( $error_code, $error_message );
+	protected function error( $code, $message, $http_status_code = 400, $data = array() ) {
+		throw new WC_Data_Exception( $code, $message, $http_status_code, $data );
 	}
 }
diff --git a/includes/abstracts/abstract-wc-product.php b/includes/abstracts/abstract-wc-product.php
index 64264cfae5c..133e5bed008 100644
--- a/includes/abstracts/abstract-wc-product.php
+++ b/includes/abstracts/abstract-wc-product.php
@@ -804,7 +804,9 @@ class WC_Product extends WC_Abstract_Legacy_Product {
 	public function set_sku( $sku ) {
 		$sku = (string) $sku;
 		if ( $this->get_object_read() && ! empty( $sku ) && ! wc_product_has_unique_sku( $this->get_id(), $sku ) ) {
-			$this->error( 'product_invalid_sku', __( 'Invalid or duplicated SKU.', 'woocommerce' ) );
+			$sku_found = wc_get_product_id_by_sku( $sku );
+
+			$this->error( 'product_invalid_sku', __( 'Invalid or duplicated SKU.', 'woocommerce' ), 400, array( 'resource_id' => $sku_found ) );
 		}
 		$this->set_prop( 'sku', $sku );
 	}
diff --git a/includes/abstracts/abstract-wc-rest-terms-controller.php b/includes/abstracts/abstract-wc-rest-terms-controller.php
index 6eaa570f112..a53e2161788 100644
--- a/includes/abstracts/abstract-wc-rest-terms-controller.php
+++ b/includes/abstracts/abstract-wc-rest-terms-controller.php
@@ -378,15 +378,15 @@ abstract class WC_REST_Terms_Controller extends WC_REST_Controller {
 
 		$term = wp_insert_term( $name, $taxonomy, $args );
 		if ( is_wp_error( $term ) ) {
+			$error_data = array( 'status' => 400 );
 
-			// If we're going to inform the client that the term exists, give them the identifier
-			// they can actually use.
-			if ( ( $term_id = $term->get_error_data( 'term_exists' ) ) ) {
-				$existing_term = get_term( $term_id, $taxonomy );
-				$term->add_data( $existing_term->term_id, 'term_exists' );
+			// If we're going to inform the client that the term exists,
+			// give them the identifier they can actually use.
+			if ( $term_id = $term->get_error_data( 'term_exists' ) ) {
+				$error_data['resource_id'] = $term_id;
 			}
 
-			return $term;
+			return new WP_Error( $term->get_error_code(), $term->get_error_message(), $error_data );
 		}
 
 		$term = get_term( $term['term_id'], $taxonomy );
diff --git a/includes/api/class-wc-rest-coupons-controller.php b/includes/api/class-wc-rest-coupons-controller.php
index 4b151ea243e..160161106ec 100644
--- a/includes/api/class-wc-rest-coupons-controller.php
+++ b/includes/api/class-wc-rest-coupons-controller.php
@@ -364,7 +364,7 @@ class WC_REST_Coupons_Controller extends WC_REST_Posts_Controller {
 			$coupon->save();
 			return $coupon->get_id();
 		} catch ( WC_Data_Exception $e ) {
-			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
+			return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
 		} catch ( WC_REST_Exception $e ) {
 			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
 		}
diff --git a/includes/api/class-wc-rest-orders-controller.php b/includes/api/class-wc-rest-orders-controller.php
index 7f8e4b5989e..d96e79c595b 100644
--- a/includes/api/class-wc-rest-orders-controller.php
+++ b/includes/api/class-wc-rest-orders-controller.php
@@ -437,7 +437,7 @@ class WC_REST_Orders_Controller extends WC_REST_Posts_Controller {
 
 			return $order->get_id();
 		} catch ( WC_Data_Exception $e ) {
-			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
+			return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
 		} catch ( WC_REST_Exception $e ) {
 			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
 		}
@@ -466,7 +466,7 @@ class WC_REST_Orders_Controller extends WC_REST_Posts_Controller {
 
 			return $order->get_id();
 		} catch ( WC_Data_Exception $e ) {
-			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
+			return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
 		} catch ( WC_REST_Exception $e ) {
 			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
 		}
diff --git a/includes/api/class-wc-rest-products-controller.php b/includes/api/class-wc-rest-products-controller.php
index b8a5ec4b6e1..4b363519f8e 100644
--- a/includes/api/class-wc-rest-products-controller.php
+++ b/includes/api/class-wc-rest-products-controller.php
@@ -766,7 +766,7 @@ class WC_REST_Products_Controller extends WC_REST_Posts_Controller {
 			return $response;
 		} catch ( WC_Data_Exception $e ) {
 			$this->delete_post( $product_id );
-			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
+			return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
 		} catch ( WC_REST_Exception $e ) {
 			$this->delete_post( $product_id );
 			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
@@ -805,7 +805,7 @@ class WC_REST_Products_Controller extends WC_REST_Posts_Controller {
 
 			return rest_ensure_response( $response );
 		} catch ( WC_Data_Exception $e ) {
-			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
+			return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
 		} catch ( WC_REST_Exception $e ) {
 			return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
 		}
diff --git a/includes/class-wc-data-exception.php b/includes/class-wc-data-exception.php
index 37d2220d363..67a3d8cb696 100644
--- a/includes/class-wc-data-exception.php
+++ b/includes/class-wc-data-exception.php
@@ -4,10 +4,10 @@
  *
  * Extends Exception to provide additional data.
  *
- * @author      WooThemes
- * @category    Core
- * @package     WooCommerce
- * @since       2.7
+ * @author   WooThemes
+ * @category Core
+ * @package  WooCommerce
+ * @since    2.7
  */
 
 if ( ! defined( 'ABSPATH' ) ) {
@@ -15,34 +15,54 @@ if ( ! defined( 'ABSPATH' ) ) {
 }
 
 /**
- * WC_Data_Exception class
+ * WC_Data_Exception class.
  */
 class WC_Data_Exception extends Exception {
 
-	/** @var string sanitized error code */
+	/**
+	 * Sanitized error code.
+	 *
+	 * @var string
+	 */
 	protected $error_code;
 
+	/**
+	 * Error extra data.
+	 *
+	 * @var array
+	 */
+	protected $error_data;
+
 	/**
 	 * Setup exception.
 	 *
-	 * error code - machine-readable, e.g. `woocommerce_invalid_product_id`
-	 * error message - friendly message, e.g. 'Product ID is invalid'
-	 * http status code - proper HTTP status code to respond with, e.g. 400
-	 *
-	 * @param string $error_code
-	 * @param string $error_message user-friendly translated error message
-	 * @param int $http_status_code HTTP status code to respond with
+	 * @param string $code             Machine-readable error code, e.g `woocommerce_invalid_product_id`.
+	 * @param string $message          User-friendly translated error message, e.g. 'Product ID is invalid'.
+	 * @param int    $http_status_code Proper HTTP status code to respond with, e.g. 400.
+	 * @param array  $data             Extra error data.
 	 */
-	public function __construct( $error_code, $error_message, $http_status_code = 400 ) {
-		$this->error_code = $error_code;
-		parent::__construct( $error_message, $http_status_code );
+	public function __construct( $code, $message, $http_status_code = 400, $data = array() ) {
+		$this->error_code = $code;
+		$this->error_data = array_merge( array( 'status' => $http_status_code ), $data );
+
+		parent::__construct( $message, $http_status_code );
 	}
 
 	/**
-	 * Returns the error code
+	 * Returns the error code.
+	 *
 	 * @return string
 	 */
 	public function getErrorCode() {
 		return $this->error_code;
 	}
+
+	/**
+	 * Returns error data.
+	 *
+	 * @return array
+	 */
+	public function getErrorData() {
+		return $this->error_data;
+	}
 }