RightNow call from java using v1.3 results in "Data element in the Message is NULL" message

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Hello everybody, I am noob with RightNow and I am trying to understand what is going on when calling the API to retrieve some data.

I have a simple select query with CustomFields, executed using wsdl 1.3 definition, like this:

        Holder<CSVTableSet>  queryCSV = new Holder<>();
        Holder<byte[]> b = new Holder<>();
        client.queryCSV(queryString, PAGE_SIZE,",",false,true, queryCSV, b);

where query is like this

SELECT C.Emails.Address,
       C.CustomFields.c.Storerefnum,
       C.CustomFields.c.retailername,C.CustomFields.Retailer.contact_name,
       C.CustomFields.Retailer.house_number,C.CustomFields.Retailer.Street1,
       C.CustomFields.Retailer.Street2,C.CustomFields.Retailer.City,C.CustomFields.Retailer.postal_code,