[ERROR ORABPEL-10057]: INVALID QUERY IN COPY OPERATION

I created a BPEL project . While trying to assign the values from input
message to output message using assign activity, the namespace prefix is missing for some of the fields in the input message.

Hence am getting the below error
Error(73):
[Error ORABPEL-10057]: invalid query
[Description]: in line 73 of

"C:\jdevstudio10134\jdev\mywork\ManageProductOfferingAvailability\TransformCus
tomerQuoteToServiceOrderAS\bpel\TransformCustomerQuoteToServiceOrderAS.bpel", query

"/client:TransformCustomerQuoteToServiceOrderASProcessRequest/ns1:CustomerQuot
e/CustomerQuoteItem/ns1:id" is invalid, because step 'CustomerQuoteItem' is not valid.. Potential fix]: Check the XML schema and make sure your query string is
valid

Fix : 8500399 & 7174309(workflow)