product sku property name on sku variant values

src/Model/Entity/ProductSkuVariantValue.php

@@ -34,7 +34,7 @@ class ProductSkuVariantValue extends Entity
         'product_category_variant_option_id' => true,
 
         // entities
-        'product_skus' => true,
+        'product_sku' => true,
         'product_variant' => true,
         'product_category_variant_option' => true,
     ];

src/Model/Table/ProductSkuVariantValuesTable.php

@@ -54,6 +54,7 @@ class ProductSkuVariantValuesTable extends Table
         $this->belongsTo('ProductSkus', [
             'className' => 'CakeProducts.ProductSkus',
             'foreignKey' => 'product_sku_id',
+            'propertyName' => 'product_sku',
             'joinType' => 'INNER',
         ]);
         $this->belongsTo('ProductVariants', [