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Display available quantity of item on Sales/Invoice

1.1.  File “application/controllers/admin/Invoices.php”, below the line 365 add hook like this
Code:
        // add hook display Available quantity of item //
        $data['items']        = hooks()->apply_filters('before_admin_view_create_invoice', $data['items']);
        /////////////////////////////////////////////////
Image:

1.2. File “application/controllers/admin/Invoice_items.php”, find function “search” and update like the image
Code:
public function search()
    {
        if ($this->input->post() && $this->input->is_ajax_request()) {
            $data = $this->invoice_items_model->search($this->input->post('q'));
            /////////////////////////////////////////////////
            // add hook display Available quantity of item //
            $data = hooks()->apply_filters('admin_invoice_ajax_search_item', $data, $this->input->post('q'));
            /////////////////////////////////////////////////
            echo json_encode($data);
        }
    }
Image: