ORA-19279: XPTY0004 - XQuery dynamic type mismatch: expected singleton sequence - got multi-item sequence

Question

Hi ,
I executed the below query in database version 11.2.0.3.0, it throws the error like "ORA-19279: XPTY0004 - XQuery dynamic type mismatch: expected singleton sequence - got multi-item sequence"
with PAYMENT_XML as (
      select XMLTYPE(
        '<Document>
        <pain.002.001.02>
            <GrpHdr>
                  <MsgId>CITIBANK/20091204-PSR/4274</MsgId>
                  <CreDtTm>2009-12-04T09:36:00</CreDtTm>
           </GrpHdr>
            <OrgnlGrpInfAndSts>
            <OrgnlMsgId>10002</OrgnlMsgId>
            <OrgnlMsgNmId>pain.001.001.02</OrgnlMsgNmId>
            <OrgnlNbOfTxs>20</OrgnlNbOfTxs>
            <OrgnlCtrlSum>7000</OrgnlCtrlSum>
            <GrpSts>PART</GrpSts>
            <StsRsnInf>
              <AddtlStsRsnInf>ACK - FILE PARTIALLY SUCCESSFUL</AddtlStsRsnInf>
            </StsRsnInf>
          </OrgnlGrpInfAndSts>
          <OrgnlGrpInfAndSts>
            <OrgnlMsgId>10001</OrgnlMsgId>
            <OrgnlMsgNmId>pain.001.001.02</OrgnlMsgNmId>
            <OrgnlNbOfTxs>202</OrgnlNbOfTxs>
            <OrgnlCtrlSum>9000</OrgnlCtrlSum>
            <GrpSts>PART</GrpSts>
            <StsRsnInf>
              <AddtlStsRsnInf>ACK - FILE PARTIALLY SUCCESSFUL</AddtlStsRsnInf>
              <AddtlStsRsnInf>Formated</AddtlStsRsnInf>
            </StsRsnInf>
          </OrgnlGrpInfAndSts>
      </pain.002.001.02>
  </Document>') as OBJECT_VALUE1
   from dual
  select R.*
  from PAYMENT_XML,
       XMLTABLE(
       'for $COMP in $COMPANY/Document/pain.002.001.02
          for $DEPT at $DEPTIDX in $COMP/OrgnlGrpInfAndSts
           return <RESULT>
                    <NAME>{fn:data($COMP/GrpHdr/MsgId)}</NAME>
                      $DEPT/OrgnlMsgId,
                      $DEPT/OrgnlNbOfTxs,
                      $DEPT/OrgnlCtrlSum,
                      $DEPT/GrpSts,
                      $DEPT/StsRsnInf/AddtlStsRsnInf
                  </RESULT>'
       passing OBJECT_VALUE1 as "COMPANY"
       columns
         NAME            VARCHAR(10)  path 'NAME',
         OrgnlMsgId      VARCHAR2(24) path 'OrgnlMsgId',
         ORGNLNBOFTXS    VARCHAR2(24) path 'OrgnlNbOfTxs',
         ORGNLCTRLSUM    NUMBER       path 'OrgnlCtrlSum',
         GRPSTS          VARCHAR2(24) path 'GrpSts',
         ADDTLSTSRSNINF  VARCHAR2(40) path 'AddtlStsRsnInf'
     ) r
Errors comes this part :
            <StsRsnInf>
              <AddtlStsRsnInf>ACK - FILE PARTIALLY SUCCESSFUL</AddtlStsRsnInf>
              <AddtlStsRsnInf>Formated</AddtlStsRsnInf>
            </StsRsnInf>
if i put the single statement for this xml element <AddtlStsRsnInf> it works fine if more than one element comes it raised the error.
i want the output like the below format : want to merge the element value with (, comma)  delimiter with single coloumn value
NAME
ORGNLMSGID
ORGNLNBOFTXS
ORGNLCTRLSUM
GRPSTS
ADDTLSTSRSNINF
CITIBANK/2
10002
20
7,000
PART
ACK - FILE PARTIALLY SUCCESSFUL
CITIBANK/2
10001
202
9,000
PART
ACK - FILE PARTIALLY SUCCESSFUL, Formated
Thanks is advance for reply
Thanks,
Chidam

Answer 1

Try with XQuery string-join() function :
ADDTLSTSRSNINF  VARCHAR2(40) path 'string-join(AddtlStsRsnInf, ", ")'