diff --git a/Inflow/__init__.py b/Inflow/__init__.py
index 5a298adfd084e1e8cedf6d0680d1cc7e58d3c988..b1a58867aea2100d48a778272aa29a5c630e06f2 100644
--- a/Inflow/__init__.py
+++ b/Inflow/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "1.1.27"
+__version__ = "1.1.28"
 
 def ask_for_session_label_gui():
     import tkinter as tk
diff --git a/Inflow/pandex/accessors.py b/Inflow/pandex/accessors.py
index 63efba503aa88f25212723f82ff3bdb72f1beca0..9eb43ba5e5f7ddf6115d7d04010647825f17f162 100644
--- a/Inflow/pandex/accessors.py
+++ b/Inflow/pandex/accessors.py
@@ -34,4 +34,24 @@ class GroupUtilsAccessor:
     def groupby(self, condition_keys,*args,**kwargs):
         for condition_values , group in self._obj.groupby(condition_keys,*args,**kwargs):
             conditions = {key : value for key, value in zip(condition_keys , condition_values)}
-            yield conditions, group
\ No newline at end of file
+            yield conditions, group
+
+@pd.api.extensions.register_series_accessor("one")
+class OneAcessor:
+    def __init__(self, pandas_obj) -> None:
+        self._validate(pandas_obj)
+        self._obj = pandas_obj
+        self.project = self._obj.projects[0]
+
+    @staticmethod
+    def _validate(obj):
+        required_fields = ["path","alias","subject","date","number","json","qc","rel_path","admin_url", "projects"]
+        missing_fields = []
+        for req_field in required_fields :
+            if not req_field in obj.index :
+                missing_fields.append(req_field)
+        if len(missing_fields):
+            raise AttributeError(f"The series must have some fields to use one acessor. This object is missing fields : {','.join(missing_fields)}")
+        
+    def add_pipelines_accessors(self):
+        pass