Trying to update a quote field

Trying to update a quote field

I want to be able to update a quote field using XML. I wrote the code based on the information in the docs but I am getting this error '4600Unable to process your request. Please verify if the name and value is appropriate for the "xmlData" parameter.'. I'm not sure what is missing but any help would be greatly appreciated. 

here is my code
  1. $request_url = 'https://crm.zoho.com/crm/private/xml/Quotes/updateRecords?authtoken=AuthToken&scope=crmapi
  2. &newFormat=1
  3. &id=TheIdOfTheQuote
  4. &xmlData=<Quotes>
  5. <row no="1">
  6. <FL val="Authorization">a signed contract, authorizing us to proceed</FL>
  7. </row>
  8. </Quotes>';

  10. $curl = curl_init( $request_url );
  11.  
  12. curl_setopt( $curl, CURLOPT_RETURNTRANSFER, true );
  13. curl_setopt( $curl, CURLOPT_CONNECTTIMEOUT, 5 );  
  14. $curl_response = curl_exec( $curl );
  15. print_r($response = curl_exec($curl));
  16. curl_close( $curl );