diff --git a/htdocs/compta/facture/class/api_invoices.class.php b/htdocs/compta/facture/class/api_invoices.class.php
index 0fb203f50d1..555b6179677 100644
--- a/htdocs/compta/facture/class/api_invoices.class.php
+++ b/htdocs/compta/facture/class/api_invoices.class.php
@@ -839,118 +839,6 @@ class Invoices extends DolibarrApi
         return $this->_cleanObjectDatas($this->invoice);
     }
 
-    /**
-     * Make credt note from invoice
-     *
-     * @param   int 	$id            Invoice ID
-     * @url POST    {id}/makecreditnote
-     *
-     * @return  array 	An invoice object
-     *
-     * @throws 200
-     * @throws 304
-     * @throws 401
-     * @throws 404
-     * @throws 500
-     */
-    function makecreditnote($id)
-    {
-        if(! DolibarrApiAccess::$user->rights->facture->creer) {
-                throw new RestException(401);
-        }
-		
-		$this->db->begin();
-		
-        $result = $this->invoice->fetch($id);
-        if( ! $result ) {
-                throw new RestException(404, 'Invoice not found');
-        }
-
-        if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
-                throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
-        }
-
-		$result = $this->invoice->fetch_thirdparty();
-        if( ! $result ) {
-                throw new RestException(404, 'Thirdparty not found');
-        }
-
-		if (! $object->paye)	// protection against multiple submit
-		{
-		   	$this->invoice->fetch_lines();
-				
-			// Boucle sur chaque taux de tva
-			$i=0;
-			foreach($this->invoice->lines as $line)
-			{
-				$amount_ht[$line->tva_tx]+=$line->total_ht;
-				$amount_tva[$line->tva_tx]+=$line->total_tva;
-				$amount_ttc[$line->tva_tx]+=$line->total_ttc;
-				$i++;
-			}
-
-			// Insert one discount by VAT rate category
-			$discount = new DiscountAbsolute($this->db);
-			if ($this->invoice->type == 2)     $discount->description='(CREDIT_NOTE)';
-			elseif ($this->invoice->type == 3) $discount->description='(DEPOSIT)';
-			else {
-				$this->error="CantConvertToReducAnInvoiceOfThisType";
-				return -1;
-			}
-			$discount->tva_tx=abs($this->invoice->total_ttc);
-			$discount->fk_soc=$this->invoice->socid;
-			$discount->fk_facture_source=$this->invoice->id;
-
-			$error=0;
-			foreach($amount_ht as $tva_tx => $xxx)
-			{
-				$discount->amount_ht=abs($amount_ht[$tva_tx]);
-				$discount->amount_tva=abs($amount_tva[$tva_tx]);
-				$discount->amount_ttc=abs($amount_ttc[$tva_tx]);
-				$discount->tva_tx=abs($tva_tx);
-
-				$result=$discount->create(DolibarrApiAccess::$user);
-				if ($result < 0)
-				{
-					$error++;
-					break;
-				}
-			}
-
-			if (! $error)
-			{
-				// Classe facture
-				$result=$this->invoice->set_paid(DolibarrApiAccess::$user);
-				if ($result > 0)
-				{
-					//$mesg='OK'.$discount->id;
-					$this->db->commit();
-				}
-				else
-				{
-					throw new RestException(500, 'Could not set paid');
-					$this->db->rollback();
-				}
-			}
-			else
-			{
-				throw new RestException(500, 'Discount error');
-				$this->db->rollback();
-			}
-		}
-
-        $result = $this->invoice->fetch($id);
-        if( ! $result ) {
-            throw new RestException(404, 'Invoice not found');
-        }
-
-        if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
-            throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
-        }
-
-        return $this->_cleanObjectDatas($this->invoice);
-    }
-
      /**
      * Add a discount line into an invoice (as an invoice line) using an existing absolute discount
      *