diff --git a/date.py b/date.py
deleted file mode 100644
index e69de29..0000000
diff --git a/diary.py b/diary.py
new file mode 100644
index 0000000..e1f37d3
--- /dev/null
+++ b/diary.py
@@ -0,0 +1,9 @@
+from trytond.model import (
+    ModelSQL, ModelView, fields)
+
+class Diary(ModelSQL, ModelView):
+    'Diary'
+    __name__ = 'optical_equipment.maintenance.diary'
+
+    code = fields.Char(
+    "Code", select=True,states={'readonly': True })
diff --git a/maintenance.py b/maintenance.py
index c35bfce..b28aedb 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -27,6 +27,7 @@ class Maintenance(Workflow, ModelSQL, ModelView):
 
 
     #when the maintenance is in agended status
+    diary = fields.One2Many('optical_equipment.maintenance.diary', 'diary')
     estimated_agended = fields.DateTime("Date Maintenance")
     technical = fields.Many2One('company.employee')