class Mcab(PeristentObject):

    numero_is    = CounterField(db_name='mcab', title="Numero")
    pro_is       = LookupField(Pro, title="Proveïdor", required=True)
    ref_is       = StringField(title="Referencia")
    data_is      = DateField(title="Data", required=True)
    datae_is     = DateField(title="Data Entrega")
    envio_is     = CompositeField(Envio, title="Entrega", required=True)
    obs_is       = TextField(title="Observacions")
    mlins_is     = DetailSpec('mlin', title="Linees Comanda")

class Mlin(PersistentObject):

    mcab_is      = LookupField(Mcab, title="Comanda", readonly=True)
    data_is      = DateField(title="Data", computed=True)
    datae_is     = DateField(title="Data Entrega", computed=True)
    pro_is       = LookupField(Pro, title="Proveidor", computed=True)
    art_is       = LookupField(Art, title="Article", required=True)
    des_is       = StringField(title="Descripcio", required=True)
    quant_is     = QuantityField(title="Quant. dem", required=True)
    preu_is      = PreuField(title="Preu")
    impor_is     = ImportField(title="Import", computed=True)
    ser_is       = BoolField(options=[(False,"Pendent"),(True,"Servit")], 
                               title="Situacio", computed=True)

    impor_is     = ImportField(title="Import", computed=True)