If you only want to verify if the "Preview" button give the right PDF, just copy your <Rowsets> XML into "XML Data Source" and browse for the right XDP file ( do not forget to import the XDP file into your MII project before browse for it). with these 2 inputs, Preview should be working.
If you want to verify if the "dynamic data" from Query Template get properly feed to PDF, you have to know how to map parameter of action blocks in MII transaction. I think you can find better description on this from MII help document. But the basic idea will be using a proper action block under Data Query catalog to read the XML <rowsets> from your barcode Query Template. Then, in your ADS action block, in "Links" configuration, map the output of Data Query to your "input" of ADS action. with the statically configured XDP file, your transaction should be working. But make sure the save, or Print checked, otherwise, everything happen in back end but nothing visible to you.