{ "rules_test" : {
    "LABEL" : "Calcular X",
    "PLUGIN" : "reaction rule",
    "WEIGHT" : "1",
    "REQUIRES" : [
      "rules",
      "commerce_line_item",
      "commerce_cart",
      "commerce_product_reference"
    ],
    "ON" : [ "commerce_product_calculate_sell_price" ],
    "IF" : [
      { "entity_has_field" : { "entity" : [ "commerce-line-item" ], "field" : "commerce_product" } },
      { "component_rules_pvc" : { "product" : [ "commerce-line-item:commerce-product" ] } },
      { "NOT data_is_empty" : { "data" : [ "commerce-line-item:commerce-total:amount" ] } },
    ],
    "DO" : [
      { "variable_add" : {
          "USING" : {
            "type" : "commerce_price",
            "value" : { "value" : { "amount" : "", "currency_code" : "EUR" } }
          },
          "PROVIDE" : { "variable_added" : { "variable_added" : "Added variable" } }
        }
      },
      { "LOOP" : {
          "USING" : { "list" : [ "commerce-line-item:order:commerce-line-items" ] },
          "ITEM" : { "list_item" : "Elemento actual de lista" },
          "DO" : [
            { "data_calc" : {
                "USING" : {
                  "input_1" : [ "variable-added:amount" ],
                  "op" : "+",
                  "input_2" : [ "commerce-line-item:commerce-total:amount" ]
                },
                "PROVIDE" : { "result" : { "result" : "Calculation result" } }
              }
            }
          ]
        }
      },
      { "commerce_cart_product_add_by_sku" : {
          "USING" : {
            "user" : [ "site:current-user" ],
            "sku" : "XXXX",
            "quantity" : "1",
            "combine" : 1
          },
          "PROVIDE" : { "product_add_line_item" : { "product_add_line_item" : "Added product line item" } }
        }
      },
      { "commerce_line_item_unit_price_add" : {
          "commerce_line_item" : [ "commerce_line_item" ],
          "amount" : [ "variable-added:amount" ],
          "component_name" : "fee",
          "round_mode" : "0"
        }
      }
    ]
  }
}