title: No transition from ASSIGNED viewflow
body: <p>Previously i had an <a href="https://stackoverflow.com/questions/61024929/how-to-assign-process-pk-to-a-foreign-key-field-in-viewflow?noredirect=1#comment107962209_61024929">issue</a> with viewflow as i was attempting to assign the process pk to a foreign key field. It seems like the issue has been resolved , however i am recieving another message error as seen below  </p>
  
  <pre><code>No transition from ASSIGNED
  </code></pre>
  
  <p>It seems like the error may be coming from my flows.py :  </p>
  
  <pre><code>class Pipeline(Flow):
  process_class = PaymentVoucherProcess
  
  start = (
      flow.Start( 
          CreateProcessView,
          fields=["payment_code","bPBankAccount"]
      ).Permission(
          auto_create=True
      ).Next(this.approve)
  )
  
  approve = (
      flow.View(
          Signature,
          fields=["eSignatureModel"]
      ).Permission(
          auto_create=True
      ).Next(this.check_approve)
  )
  
  check_approve = (
      flow.If(lambda activation: activation.process.eSignatureModel)
      .Then(this.send)
      .Else(this.end)
  )
  
  send = (
      flow.Handler(
          this.send_hello_world_request
      ).Next(this.end)
  )
  
  end = flow.End()
  
  def send_hello_world_request(self, activation):
      print(activation.process.payment_code)
  </code></pre>
  
  <p>or my views.py:</p>
  
  <pre><code>@flow_view
  def Signature(request):
      form = SignatureForm(request.POST or None)
      if form.is_valid():
          esig = form.save(commit=False)
          signature = form.cleaned_data.get('signature')
          if signature:
              signature_picture = draw_signature(signature)
              signature_file_path = draw_signature(signature, as_file=True)
          esig.paymentVoucherProcess = request.activation.process
          esig.save()
          request.activation.done()
          return redirect(get_next_task_url(request, request.activate_next.process))
  
      return render(request, 'cash/pipeline/jsig.html', {
          'form': form,
          'activation': request.activation
      })
  </code></pre>
  
  <p>Google doesn't give me much information on how to debug this , maybe someone with experience can assist me? I would greatly appreciate it! </p>