This line is wrong:
    suplidor = db().select(db.supplier.id,db.supplier.discount)

It should be *after *form.process().accepted and it should be:

        suplidor = db(db.supplier.id == form.vars.supplier).select(db.
supplier.id,db.supplier.discount).first()

This line is wrong:
  session.descuento = db.supplier.discount

It should be:
    session.descuento =  suplidor.discount
 

Note that I'm ignoring

    thisrec = db.supplier(request.args)

As it doesn't make any sense, to me, given how I'm interpreting this code.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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