Bursting not creating multiple files when using After Report Trigger

I have a Concurrent Program with an XML Publisher data template and bursting control file defined in EBS R12.2.8.  The bursting control separates the file by using an element within the XML file and saves the bursted documents in the filesystem :

<xapi:request select="/COARENTBURST/LIST_Q1/Q1/DOCUMENT/OutboundPaymentInstruction/OutboundPayment/DocumentPayable">

   <xapi:delivery>     

       <xapi:filesystem id="111" output="/mnt/AP/RentStatement_${COA_CHECK_NUMBER}.pdf">  </xapi:filesystem>     

   </xapi:delivery>

   <xapi:document output-type="pdf" delivery="111">

       <xapi:template  type="rtf"  location="xdo://CACA.COARENTBURST.en.00/?getSource=true"> </xapi:template>

   </xapi:document>

</xapi:request>

This bursting control file works when submitting the Concurrent Program and selecting the "Burst Output" option when submitting the Concurrent Request. It ends up creating multiple documents with the name that includes the unique $[COA_CHECK_NUMBER] in the document name.