Hello,

i am a newbie on creating my own reports, so i've just take a look at "sale.report" or "purchase.report" models as reference.

I just saw, on the select query, something like:

SELECT min(l.id) as id,
    s.date_order as date_order,
    p.product_tmpl_id,
    t.categ_id as category_id

....

what is the meaning "l", "s", "p" and "t" at the beggining of each value?