diff --git a/www-api/app/Controllers/Bko.php b/www-api/app/Controllers/Bko.php
index b6618f52..7c029078 100644
--- a/www-api/app/Controllers/Bko.php
+++ b/www-api/app/Controllers/Bko.php
@@ -80,7 +80,7 @@ class Bko extends BaseController
         }
 
         if ($_SERVER["REQUEST_METHOD"] == "POST") {
-            $in = flatten(json_decode(file_get_contents('php://input'), true));
+            $in = $this->flatten(json_decode(file_get_contents('php://input'), true));
         }
         if ($_SERVER["REQUEST_METHOD"] == "PUT") {
             parse_str(file_get_contents('php://input'), $in);
@@ -113,4 +113,15 @@ class Bko extends BaseController
         echo json_encode(( new ResultFormatter() )->processOutJson($in, $out));
         exit();
     }
+    function flatten($data, $parentkey = "") {
+        $result = array();
+        foreach ($data as $key => $val) {
+            if (is_array($val)) {
+                $result = array_merge($result, flatten($val, $parentkey . $key . "_"));
+            } else {
+                $result[$parentkey . $key] = $val;
+            }
+        }
+        return $result;
+    }
 }
\ No newline at end of file