Get node values when i map datasource values to my request

thanks for your response,

i know it should be independent, but in my scenario i have to pass previous test case response node values to my current test case request nodes so i have to do this 

so if you can help me on below i think i can figure out the solution

in groovy script i want to get node value from request but that node has mapped to datasource value

--> I created data source step with key as ProposerPostcode and value  as "m22 3gh"

and i have written below line to get the value from request

def Ppc = request1.getNodeValue('//*[local-name()="Proposer"]/*:Address/*postCode')

log.info Ppc

In this case i want to get data source value (m22 3gh) but it is printing "${DataSource#ProposerPostcode}"

i think now it may clear to you what i am asking

thanks

Anusha