Skip rule is not working as expected in NegotiationApproval BPM Task

Summary:

We have a requirement to create a SQL query based skip rule for the NegotiationApproval task. We are using oraext:query-database-with-bindvar to write the skip rule and trying to pass the auctionheaderid as a parameter. We tried passing /task:task/task:payload/ns7:findNegotiationApprovalHeaderVOResponse/ns7:result/ns4:AuctionHeaderId as the parameter (as mentioned in doc id 2663059.1 ). We also tried passing /task:task/task:payload/task:AuctionHeaderId as the parameter. However, in both the cases, the query is not returning any value. If we pass the auction header id parameter as a hardcoded value (for example 300000344067336) then the query returns correct value.