Hello,
This sounds like something which is much easier done using a Property Transfer. Just create a Property Transfer TestStep somewhere inbetween the two requests (or if you already have one, you can use that) and add a transfer, which transfers the source "node" element to the target element. Be sure to check the "Transfer Child Nodes" checkbox!
When done, the source and target fileds should have something similar to:
declare namespace ns1='urn:iskratel-si:itnbsp-1-0';
//ns1:getDestinationCriteriaResponse[1]
declare namespace ns1='urn:iskratel-si:itnbsp-1-0';
//urn:modifyDestinationCriteriaRequest[1]
Regards,
Dain
eviware.com