How to rename the fields of ejbql query in ireport?

I'm using iReport 3.7.3 with ejbql connection. My problem is when I want to get the fields from the query, the ireport sets the name of the fields with "COLUMN_1", "COLUMN_2" even if I use the sentence "as" the ireport gets me that name to the fields. Here's an example of my query:

select doc.docId as DocumentID, doc.transa开发者_开发百科ctionDate as TransationDate from Document doc

1. right-click on the field
2. rename the field, e.g. My_campo
3. set description = COLUMN_1