invoiceninja/app/Models/BankSubaccount.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * Class BankSubaccount.
 */
class BankSubaccount extends Model
{
    use SoftDeletes;
    /**
     * @var array
     */
    protected $dates = ['deleted_at'];

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function bank_account()
    {
        return $this->belongsTo(BankAccount::class);
    }
}