You can use validation rules to ensure that the values of the iblock property list are valid when creating or updating a new element in Bitrix. Here's how you can do it:
1. Define the validation rules for the iblock property list in the element's class definition. You can do this by adding a rule to the rules() method of the element's class. For example, if you have a property named "names" that is a list of names, you can add a validation rule like this:
```php
public function rules()
{
return [
['names', 'each', 'rule' => ['string']],
];
}
```
This validation rule ensures that each value in the "names" property list is a string.
2. Before saving or updating the element, you can validate the values of the iblock property list using the validate() method of the element's class. For example, in your CommissionService class, you can call the validate() method before saving the element:
```php
$element = new CommissionService();
$element->names = ['John', 'Doe', 'Jane'];
if ($element->validate()) {
// Save or update the element
} else {
// Handle validation errors
}
```
By following these steps, you can ensure that the values of the iblock property list are valid when creating or updating a new element in Bitrix.