diff --git a/loopback/util/flatten.js b/loopback/util/flatten.js
index d6030f7d03..35c368d3b9 100644
--- a/loopback/util/flatten.js
+++ b/loopback/util/flatten.js
@@ -1,7 +1,22 @@
 
+/**
+ * Flattens an array of objects by converting each object into a flat structure.
+ *
+ * @param {Array} dataArray Array of objects to be flattened
+ * @return {Array} Array of flattened objects
+ */
 function flatten(dataArray) {
     return dataArray.map(item => flattenObj(item.__data));
 }
+
+/**
+ * Recursively flattens an object, converting nested properties into a single level object
+ * with keys representing the original nested structure.
+ *
+ * @param {Object} data The object to be flattened
+ * @param {String} [prefix=''] Optional prefix for nested keys
+ * @return {Object} Flattened object
+ */
 function flattenObj(data, prefix = '') {
     let result = {};
     try {
diff --git a/modules/entry/back/methods/entry/getBuysCsv.js b/modules/entry/back/methods/entry/getBuysCsv.js
index 647f41d22e..a46f09c669 100644
--- a/modules/entry/back/methods/entry/getBuysCsv.js
+++ b/modules/entry/back/methods/entry/getBuysCsv.js
@@ -40,27 +40,3 @@ module.exports = Self => {
         return [toCSV(dataFlatted), 'text/csv', `inline; filename="buys-${id}.csv"`];
     };
 };
-// function flattenJSON(dataArray) {
-//     return dataArray.map(item => flatten(item.__data));
-// }
-// function flatten(data, prefix = '') {
-//     let result = {};
-//     try {
-//         for (let key in data) {
-//             if (!data[key]) continue;
-
-//             const newKey = prefix ? `${prefix}_${key}` : key;
-//             const value = data[key];
-
-//             if (typeof value === 'object' && value !== null && !Array.isArray(value))
-//                 Object.assign(result, flatten(value.__data, newKey));
-//             else
-//                 result[newKey] = value;
-//         }
-//     } catch (error) {
-//         console.error(error);
-//     }
-
-//     return result;
-// }
-