def determine_items_structure
      items_params = {}
      @document.items.each do |item|
        items_params[:names] = true unless item.name.empty?
        items_params[:variables] = true unless item.variable.empty?
        items_params[:quantities] = true unless item.quantity.empty?
        items_params[:units] = true unless item.unit.empty?
        items_params[:prices] = true unless item.price.empty?
        items_params[:taxes] = true unless item.tax.empty?
        items_params[:taxes2] = true unless item.tax2.empty?
        items_params[:taxes3] = true unless item.tax3.empty?
        items_params[:amounts] = true unless item.amount.empty?
      end
      items_params
    end
def determine_items_structure
      items_params = {}
      @document.items.each do |item|
        items_params[:names] = true unless item.name.empty?
        items_params[:variables] = true unless item.variable.empty?
        items_params[:quantities] = true unless item.quantity.empty?
        items_params[:units] = true unless item.unit.empty?
        items_params[:prices] = true unless item.price.empty?
        items_params[:taxes] = true unless item.tax.empty?
        items_params[:taxes2] = true unless item.tax2.empty?
        items_params[:taxes3] = true unless item.tax3.empty?
        items_params[:amounts] = true unless item.amount.empty?
      end
      items_params
    end
Determine sections of the items table to show based on provided data