Since there isn't an option for managing special order requests on POS interface I've created a new module: is substantially a new model and relative views that record categories (add, subtract and instructions) and sub items on an order. The model is called on pos.order.line via a many2many widget/field.

Obviously if the order is taken on stock interface there are no issues, but adding it to the pos interface is driving me crazy and since i'm not an expert on js I'm stuck.

Is there someone who knows what widget I need to inherit (or modify) to show my custom field and link it to the correct order line?