// Fix product multishop association when the product is created before the shop

controllers/admin/AdminProductsController.php

@@ -356,7 +356,16 @@ class AdminProductsControllerCore extends AdminController
 	{
 		$result = parent::loadObject($opt);
 		if ($result && Validate::isLoadedObject($this->object))
+		{
+			if (Shop::getContext() == Shop::CONTEXT_SHOP && !$this->object->isAssociatedToShop())
+			{
+				$default_product = new Product((int)$this->object->id, false, null, (int)$this->object->id_shop_default);
+				$def = ObjectModel::getDefinition($this->object);
+				foreach ($def['fields'] as $field_name => $row)
+					$this->object->$field_name = $default_product->$field_name;
+			}
 			$this->object->loadStockData();
+		}
 		return $result;
 	}