Fetching abstract xpath using Count(bpws:getVariableData(....)) results in null error in SOA 11g

I am having one requirement where I need to fetch each productOrderItem from request but this element is not part of input schema type. It will be extended during runtime.

I have create BPEL2.0  Synchronous process and add one assign activity. Now I need to count productOrderItem node to a variable say count. But BPEL will not allow us to compile code with abstract path.

Solution: Use bpws:getVariableData() BPEL1.1 syntax or ora:countNodes

ora:countNodes('$inputVariable','payload','/client:customerDetails/client:productOrderItem')

OR

count(bpws:getVariableData('$inputVariable','payload','/client:customerDetails/client:productOrderItem'))

Test: After deployment open em console and paste below request

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

    <soap:Body>

        <ns1:process xmlns:ns1="http://xmlns.oracle.com/POCs/AbstractpathProject/BPELProcess">

                                <ns1:OrderID>1111</ns1:OrderID>

                                <ns1:customerDetails>

                                                <ns1:customerId>1234</ns1:customerId>

                                                <ns1:orderStatus>Submitted</ns1:orderStatus>

                                                <ns1:orderSubStatus>Confirmed</ns1:orderSubStatus>

                                                <ns1:productName>D2H</ns1:productName>

                                                <ns1:productOrderItem>

                                                                <ns1:action>ADD</ns1:action>

                                                                <ns1:description>D2H Package</ns1:description>

                                                                <ns1:name>D2H Gold</ns1:name>

                                                                <ns1:objectType>Loyalty Package</ns1:objectType>

                                                                <ns1:productPrices>

                                                                                <ns1:productPrice>

                                                                                                <ns1:description>Loyalty Package</ns1:description>

                                                                                                <ns1:name>Loyalty Package</ns1:name>

                                                                                                <ns1:price amount="15.0">

                                                                                                                <ns1:currency>

                                                                                                                                <ns1:code>EUR</ns1:code>

                                                                                                                                <ns1:symbol>€</ns1:symbol>

                                                                                                                </ns1:currency>

                                                                                                </ns1:price>

                                                                                                <ns1:priceAlteration/>

                                                                                                <ns1:period>MONTHLY</ns1:period>

                                                                                </ns1:productPrice>

                                                                </ns1:productPrices>

                                                </ns1:productOrderItem>

                                </ns1:customerDetails>

        </ns1:process>

    </soap:Body>

</soap:Envelope>

Test result should have count of 1 for productOrderItem but getting zero

<count> <count  xsi:type="def:string">0</count> </count>

Solution: BPEL 2.0 done not support / in location.
Modify like below

OLD:ora:countNodes('$inputVariable','payload','client:customerDetails/client:productOrderItem')

NEW:ora:countNodes('$inputVariable','payload','/client:customerDetails/client:productOrderItem')

<count>

<count  xsi:type="def:string">1</count>

</count>