Hi, i found an issue while editing a product, while editing there is no field to update cost of the product variant, but the code for editing a product expects a value for cost, since there's no field for product variant cost, everytime you update a product which the variant already has a cost, the cost will be set to 0.

here's the code where you get the cost for the variant:

foreach ($product_variants as $pv) {
       $update_variants[] = [
              'id'    => $this->input->post('variant_id_' . $pv->id),
               'name'  => $this->input->post('variant_name_' . $pv->id),
               'cost'  => $this->input->post('variant_cost_' . $pv->id),
               'price' => $this->input->post('variant_price_' . $pv->id),
        ];
 }

also, what's the purpose of that cost? i read in another question that in the profit you don't use that cost, instead you use the main product's cost