diff --git a/htdocs/product/class/api_products.class.php b/htdocs/product/class/api_products.class.php
index 2a9f407bf54..81e2659d918 100644
--- a/htdocs/product/class/api_products.class.php
+++ b/htdocs/product/class/api_products.class.php
@@ -246,8 +246,13 @@ class Products extends DolibarrApi
             }
             $this->product->$field = $value;
         }
+        
+        $updatetype = false;
+        if ($this->product->type != $oldproduct->type && ($this->product->isProduct() || $this->product->isService())) {
+            $updatetype = true;
+        }
 
-        $result = $this->product->update($id, DolibarrApiAccess::$user, 1, 'update');
+        $result = $this->product->update($id, DolibarrApiAccess::$user, 1, 'update', $updatetype);
 
         // If price mode is 1 price per product
         if ($result > 0 && ! empty($conf->global->PRODUCT_PRICE_UNIQ)) {
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 1b46a656511..2b3fc3ece65 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -787,13 +787,14 @@ class Product extends CommonObject
      *    Update a record into database.
      *  If batch flag is set to on, we create records into llx_product_batch
      *
-     * @param  int    $id        Id of product
-     * @param  User   $user      Object user making update
-     * @param  int    $notrigger Disable triggers
-     * @param  string $action    Current action for hookmanager ('add' or 'update')
-     * @return int                 1 if OK, -1 if ref already exists, -2 if other error
+     * @param  int     $id          Id of product
+     * @param  User    $user        Object user making update
+     * @param  int     $notrigger   Disable triggers
+     * @param  string  $action      Current action for hookmanager ('add' or 'update')
+	 * @param  boolean $updatetype  Update product type
+     * @return int                  1 if OK, -1 if ref already exists, -2 if other error
      */
-    public function update($id, $user, $notrigger = false, $action = 'update')
+    public function update($id, $user, $notrigger = false, $action = 'update', $updatetype = false)
     {
         global $langs, $conf, $hookmanager;
 
@@ -939,6 +940,11 @@ class Product extends CommonObject
 
             $sql = "UPDATE ".MAIN_DB_PREFIX."product";
             $sql.= " SET label = '" . $this->db->escape($this->label) ."'";
+            
+            if ($updatetype && ($this->isProduct() || $this->isService())) {
+                $sql.= ", fk_product_type = " . $this->type;
+            }
+            
             $sql.= ", ref = '" . $this->db->escape($this->ref) ."'";
             $sql.= ", ref_ext = ".(! empty($this->ref_ext)?"'".$this->db->escape($this->ref_ext)."'":"null");
             $sql.= ", default_vat_code = ".($this->default_vat_code ? "'".$this->db->escape($this->default_vat_code)."'" : "null");