How can I get value from a FK model?

Hi,

I got this models: http://pastebin.com/w2TmyLzt

First: I used db_columns because I used a legacy database from company ERP.

I try to get, in my template the "descricao" field, in my "mercadoria" model. but I have in my "itenspedido" only "idproduto" not "idmercadoria".

My question is: how can I get "descricao" field from "mercadoria" model in my formset? 

I tried {{ itens.idproduto.idmercadoria.descricao }} , {{ itens.idproduto.idmercadoria.descricao.value }}   and not work.

P.S.: I use modelForm as default form, like this:

class PedidoItensForm(ModelForm):

    class Meta:

        model = ItensPedido

Thanks,

Regards,

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