fix view(Buy): rewrite save process.
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		@@ -20,12 +20,10 @@ def buy(request):
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        sale_form = PurchaseForm(request.POST)
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					        sale_form = PurchaseForm(request.POST)
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        sale_linea_form = SaleLineFormSet(request.POST)
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					        sale_linea_form = SaleLineFormSet(request.POST)
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        sale_summary_form = PurchaseSummaryForm(request.POST)
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					        sale_summary_form = PurchaseSummaryForm(request.POST)
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        if sale_form.is_valid() and sale_linea_form.is_valid():
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					        if sale_form.is_valid() and sale_linea_form.is_valid() and sale_summary_form.is_valid():
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            sale = sale_form.save()
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					            sale = sale_form.save()
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            lines = sale_linea_form.save(commit=False)
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					            sale_linea_form.instance = sale
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            for line in lines:
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					            sale_linea_form.save()
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                line.sale = sale
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                line.save()
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            return HttpResponseRedirect("compras")
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					            return HttpResponseRedirect("compras")
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    else:
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					    else:
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        sale_form = PurchaseForm()
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					        sale_form = PurchaseForm()
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