At present data-driven virtual services done support comparison operator, the default comparison operator will "=.", even in DevTest 10 version does't support.
But however, you can solve your problem by adding Request Data Manager Data protocol handler and Move the RqUID argument as an attribute.
Follow the below steps to solve your problem.
1. Keeps the transaction signature with only one argument. i.e. AccountNumber
2. From the workstation add the Request Data Manager to the virtual services and move the RqUID argument as an attribute.
3. To update the response with dynamic RqUID user the attribute as the magic string.
I have tested it and it is working, I got the UID what I send in the request argument.
Hope this helps,
Thanks,
Vamsi Kurukuri | Services Architect | CA Technologies