diff --git a/htdocs/expensereport/class/api_expensereports.class.php b/htdocs/expensereport/class/api_expensereports.class.php
index 3a8ae5f764d..1fc30629aea 100644
--- a/htdocs/expensereport/class/api_expensereports.class.php
+++ b/htdocs/expensereport/class/api_expensereports.class.php
@@ -546,6 +546,46 @@ class ExpenseReports extends DolibarrApi
 		);
 	}
 
+	/**
+	 * Set an expense report to draft
+	 *
+	 * @since	23.0.0	Initial implementation
+	 *
+	 * @param	int		$id		Expense report ID
+	 *
+	 * @url		POST	{id}/settodraft
+	 *
+	 * @return	Object
+	 *
+	 * @throws RestException 304
+	 * @throws RestException 403
+	 * @throws RestException 404
+	 */
+	public function setToDraft($id)
+	{
+		if (!DolibarrApiAccess::$user->hasRight('expensereport', 'creer')) {
+			throw new RestException(403, "Insufficiant rights");
+		}
+		$result = $this->expensereport->fetch($id);
+		if (!$result) {
+			throw new RestException(404, 'Expense report not found');
+		}
+
+		if (!DolibarrApi::_checkAccessToResource('expensereport', $this->expensereport->id)) {
+			throw new RestException(403, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+		}
+
+		$result = $this->expensereport->setStatut(0);
+		if ($result == 0) {
+			throw new RestException(304, 'Error nothing done. May be object is already draft');
+		}
+		if ($result < 0) {
+			throw new RestException(500, 'Error when setting to draft expense report: '.$this->expensereport->error);
+		}
+
+		return $this->_cleanObjectDatas($this->expensereport);
+	}
+
 	/**
 	 * Validate an expense report
 	 *