Django don't save a form using Floppyforms on a foreign key field

Hi guys,

I have a field called medicamento in my model that is a foreign key and I want all the values in that field to be displayed in a searcheable dropdown in my form. I was able to do that but when I try to save, it says "Select a valid choice. That choice is not one of the available choices." 

Hope u can help dudes! 

Thanks in advance  

The Code:

models.py

    class Stockmov(models.Model):

    numero = models.AutoField(primary_key=True)

    created= models.DateTimeField(auto_now_add=True,verbose_name="Fecha de Movimiento")

    author = models.ForeignKey(User,verbose_name="autor",on_delete=models.PROTECT, null=True, blank=True)

    medicamento= models.ForeignKey(Medicamento,on_delete=models.CASCADE)

    motivo= models.CharField(max_length=200)

    Cantidad = models.IntegerField()

forms.py

    class StockmovForm(forms.ModelForm):

    class Meta:

        model = Stockmov

        fields =  ['medicamento', 'motivo', 'Cantidad' ]

        widgets = {

        #'medicamento': forms.Select(attrs={'class':'form-control', 'placeholder':'Medicamento'}),

        'medicamento': forms.widgets.TextInput(attrs={'class':'form-control', 'placeholder':'Medicamento'},datalist=Medicamento.objects.all()), 

        'motivo': forms.TextInput(attrs={'class':'form-control', 'placeholder':'Motivo'}),

        'Cantidad': forms.NumberInput(attrs={'class':'form-control', 'placeholder':'Cantidad'}),

        }

        labels = {

            'medicamento':'Medicamento', 'motivo':'Motivo del Movimiento', 'Cantidad':'Cantidad del Movimiento',

        }

views.py

    class StockmovCreate(CreateView):

    model = Stockmov

    form_class = StockmovForm

    success_url = reverse_lazy('stockmov:stockmov')

    

    def form_valid(self, form):

        form.instance.author = self.request.user

        print(self.request.user)

        return super(StockmovCreate, self).form_valid(form)

Template

          <form action="" method="post">{% csrf_token %}

           {{ form.as_p }}`s`

            <div class="text-center">

              <input type="submit" id="btnCrear" class="btn btn-secondary btn-block" value="Crear Movimiento" />

            </div>

          </form>

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