Self join webservice bpel -cant able to use the variable again and again

Hi all,
I am trying to call a webservice in a loop(while loop)
the input variable(same),on assigning next value of the iteration.
Giving error
Can some one help us in getting the right way to call webservice i a loop with right variable
Thanks.
siva

Aug 29, 2012 7:44:56 PM The following exception occurred while attempting to execute operation copy at line 1,380The following exception occurred while attempting to execute operation copy at line 1,380
<payload>
<exception class="oracle.xml.parser.v2.XMLDOMException">
document node can have only one element node as child
<stack>
<f>oracle.xml.parser.v2.XMLDocument.appendChild#1212</f>
<f>oracle.xml.xpath.XPathChildAxis.getNodeList#604</f>
<f>oracle.xml.xpath.XPathStep.evaluate#555</f>
<f>oracle.xml.xpath.PathExpr.evaluate#859</f>
<f>oracle.xml.xpath.JXPathExpression.evaluate#203</f>
<f>com.collaxa.cube.xml.xpath.BPELXPathUtil.queryEvaluate#834</f>
<f>com.collaxa.cube.xml.xpath.BPELXPathUtil.evalQuery#678</f>
<f>com.collaxa.cube.engine.ext.bpel.common.BPELWMPHelper.getToValue#2702</f>
<f>com.collaxa.cube.engine.ext.bpel.common.BPELWMPHelper.copy#1977</f>
<f>com.collaxa.cube.engine.ext.bpel.common.BPELWMPHelper.performCopyTo#532</f>
<f>com.collaxa.cube.engine.ext.bpel.v1.wmp.BPEL1AssignWMP.__executeStatements#213</f>
<f>com.collaxa.cube.engine.ext.bpel.common.wmp.BaseBPELActivityWMP.perform#158</f>
<f>com.collaxa.cube.engine.CubeEngine.performActivity#2543</f>
<f>com.collaxa.cube.engine.CubeEngine._handleWorkItem#1165</f>
<f>com.collaxa.cube.engine.CubeEngine.handleWorkItem#1071</f>
<f>com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal#73</f>
<f>...</f>
</stack>
</exception>
When trying to assign the value in the second iteration,Giving the above error
But when i trying to remove operation ,It was not removing ......
Thanks,
Sivakumar

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