Managing related entries in the same form not saving all changes

[jamesdeacon]

I have three entities, Enrolments, Registrations and Cohort_Dates. An Enrolment has many Registrations and a Registration belongs to a Cohort Date.

Within my edit Enrolment CRUD I am trying to include my Registration as per the instructions here(https://backpackforlaravel.com/docs/5.x/crud-fields#manage-related-entries-in-the-same-form-create-update-delete). I would like to be able to change the Cohort Date for a registration. When including the Registration, I can edit additional fields on that model, for instance, the present field. However, when making any change to the Cohort Date, it does not save that data. I can see that it is sending it in the POST data but for some reason this isn't saved.

This is the code I am using to include the Registration in my CRUD:

CRUD::field('registrations')
            ->type('relationship')
            ->subfields([
                [
                    'name' => 'cohortDate',
                    'type' => 'relationship',
                    'attribute' => 'formatted_date',
                    'wrapper' => [
                        'class' => 'form-group col-md-6'
                    ]
                ]
            ]);

Is this a limitation of Backpack, a bug, or is there something I am doing incorrectly?

Thanks

[jamesdeacon]

Sorry if you've already wasted any time with this. I'm an idiot, the cohort_date_id was not a fillable property on my model. Please delete, thanks