Error when using clause ORDER BY in XMLAgg. Can you help me!

Question

When I using ORDER BY IN XMLAGG ( not declare in the block "begin end" ) Then it run best.
BUT I using ORDER BY in XMLAGG ( Declare in the block "Begin end;" ) Then Warning Errror : "wrong number or types of argument in call XMLAGG".
Sourcode:
Declare p_oResult CLOB;
Begin
select DISTINCT XMLAgg(XMLElement("SUMSaleByOrg",XMLAttributes(A2.FK_sBranch as "FK_sBranch",A2.sBranchName as "sBranchName"
,nvl(sum(A2.cPeriodN12),0) as "cPeriodN12"
,pkgcommonfunction.fCO11_PercentValue(nvl(sum(A2.cPeriodN12),0), 1) as "dDensityN12"
                         ,nvl(sum(A2.cPeriodN1),0) as "cPeriodN1"
,pkgcommonfunction.fCO11_PerCentValue(nvl(sum(A2.cPeriodN1),0),1) as "dDensityN1"
                         ,nvl(sum(A2.cPeriodN),0) as "cPeriodN"
,pkgcommonfunction.fCO11_PerCentValue(nvl(sum(A2.cPeriodN),0),1) as "dDensityN"
,nvl(A2.yBranchOrder,0) as "yBranchOrder")
Order by A2.yBranchOrder
).getClobVal()
INTO p_oResult
from      TempSumSale A2, TempUserLevel B2
     Where     A2.FK_sBranch=B2.PK_sBranch2
     Group by A2.yBranchOrder,A2.FK_sBranch,A2.sBranchName;
end;

Answer 1

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