Print to IPP printer using ExternalReportWSSService

I am trying to print a pdf report using ExternalReportWSSService web service. The printer is configured correctly and I am able to print from BIP console, when using web service I am getting the error "Printer Delivery Status: Failed: invalid request, Code=16".

The soap envelope is as below. Note that I have truncated the documentData element.

   <pub:deliveryService>
     <pub:deliveryRequest>
      <pub:contentType>application/pdf</pub:contentType>
      <pub:documentData>JVBERi0xLjYNCjUgMCBv</pub:documentData>
      <pub:printOption>
        <pub:printNumberOfCopy></pub:printNumberOfCopy>
        <pub:printOrientation></pub:printOrientation>
        <pub:printRange></pub:printRange>
        <pub:printSide></pub:printSide>
        <pub:printTray></pub:printTray>
        <pub:printerName>PPI-OFF-320-246-O</pub:printerName>
      </pub:printOption>
     </pub:deliveryRequest>
   </pub:deliveryService>