error after form validation

I got the following error


My model http://pastebin.com/2BuE0N0d


my view http://pastebin.com/48xEPvQz


  when it reaches this part of the code

        gr_caixafaccao = form_caixafaccao.save (commit = False)

gr_caixafaccao the object returns me Unable to get repr is <class'movimento.models.Caixafaccao'>


hence not caught the id.

can someone help me?

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