Django: save() prohibited to prevent data loss due to unsaved related object 'predictions'

Using Django Forms & APIs
3

It’s defined in my forms.py

class PredictionForm(forms.ModelForm):

    class Meta:
        model = Predictions
        fields = [
            'image',
            'title',
            'description',
            'status',
            'starting_date',
            'ending_date',
        ]
        
class PredictionDataForm(forms.ModelForm):

    class Meta:
        model = PredictionData
        fields = [
            'name',
            'description',
            'amount',
            'odds',
            'won',
            'image',
        ]


PredictionDataFormSet = inlineformset_factory(
    Predictions, PredictionData, form=PredictionDataForm,
    extra=1, can_delete=True,
    can_delete_extra=True
)