Error attempting to use updateRecords to update multiple records: 

error message:

<response uri="/crm/private/xml/Leads/updateRecords">

<result>

<row no="1">

<error>

<code>4425</code>

<details>

Unable to process your request. Please check whether you have given the valid record Id

XML data:

     <Leads>

       <row no="1">

         <FL val="Refer ID">22</FL>

       </row>

       <row no="2">

         <FL val="Refer ID">22</FL>

       </row>

       <row no="3">

         <FL val="Refer ID">22</FL>

       </row>

     </Leads>

relevant code:

     $url = " https://crm.zoho.com/crm/private/xml/Leads/updateRecords";

     $param= "authtoken=".$token."&version=4&scope=crmapi&xmlData=".$xmldata;

Not sure what the problem is... Maybe we have to include the lead ID, last name, or company name in the XML data to update a quantity of records?