Receiving the same operation twice causes execption

Hi,
We modified your example "109.CorrelationSets" to let the seller invoke AsyncPurchaseResponse twice, and let the buyer receive twice. The seller can send the message twice, however, the process generates a error message:
"NullPointerException" has been caught by a catch block,
after receiving the first AsyncPurchaseResponse, and the instance is cancelled.
The question is, can we invoke the same operation more than once? I saw a similar question in the post "Extending the 109.CorrelationSets scenario ". I know I can avoid this probblem by using different operations in the same portType, but in general this won't work because you don't know how many times the operation will be used.
I attached the modified seller.bpel and buyer.bpel. There is no change in wsdl files.
Thanks in advance for the help!
Feng
buyer.bpel
     <sequence>
          
          <receive partnerLink="Customer" portType="buyer:Buyer" operation="purchase" variable="input" createInstance="yes">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="yes"/>
               </correlations>
          </receive>
          
          <invoke partnerLink="Seller" portType="seller:Seller" operation="AsyncPurchase" inputVariable="input">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="no" pattern="out"/>
               </correlations>
          </invoke>
          
          <receive partnerLink="Seller" portType="seller:Buyer" operation="AsyncPurchaseResponse" variable="output">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="no"/>
                    <correlation set="Invoice" initiate="yes"/>
               </correlations>
          </receive>

          <receive createInstance="no" partnerLink="Seller" portType="seller:Buyer" operation="AsyncPurchaseResponse" variable="output">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="no"/>
                    <correlation set="Invoice" initiate="no"/>
               </correlations>
          </receive>
          <invoke partnerLink="Customer" portType="buyer:Customer" operation="onResult" inputVariable="output">
          </invoke>
     </sequence>
seller.bpel
     <sequence>
          
          <receive partnerLink="Buyer" portType="seller:Seller" operation="AsyncPurchase" variable="input" createInstance="yes">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="yes"/>
               </correlations>
          </receive>
          <assign>
               
               <copy>
               </copy>
          </assign>
          <wait for="PT3S"/>
          
          <invoke partnerLink="Buyer" portType="seller:Buyer" operation="AsyncPurchaseResponse" inputVariable="output">
               <correlations>
                    <correlation set="PurchaseOrder" initiate="no" pattern="out"/>
                    <correlation set="Invoice" initiate="yes" pattern="out"/>
               </correlations>
          </invoke>

          <wait for="PT3S"/>
          <invoke partnerLink="Buyer" portType="seller:Buyer" operation="AsyncPurchaseResponse" inputVariable="output">
          </invoke>
     </sequence>

Hi
any resolutions on this ? i run into a similar error where i call a Service(WSIF -EJBBinding) in a loop.
thanks
Sam

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Receiving the same operation twice causes execption

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