question about datasource

I want to do this:

- test request
- property transfer to datasource

    source: step-->testRequest  ; Property-->Response
    target: step-->Datasource
-Datasource: driver, url and query

this is because i want to test that the data of request are OK in the DataBase...

now i have this error: Mon Jul 09 12:12:43 CEST 2007:DEBUG:Setting targetStep for transfer [return] to null


is it possible? is there any examples

thanks!!!