diff --git a/timesheet_entry_block/models/timesheet.py b/timesheet_entry_block/models/timesheet.py
index 215e4e1..eb75032 100755
--- a/timesheet_entry_block/models/timesheet.py
+++ b/timesheet_entry_block/models/timesheet.py
@@ -86,11 +86,11 @@ class TimehseetBlock(models.Model):
             return super(TimehseetBlock, self).write(record)
 
 
-    @api.constrains('unit_amount')
-    def _check_unit_amount(self):
-        for rec in self:
-            if rec.unit_amount < 0.0:
-                raise AccessError('End date should be greater than start date!')
+    # @api.constrains('unit_amount')
+    # def _check_unit_amount(self):
+    #     for rec in self:
+    #         if rec.unit_amount < 0.0:
+    #             raise AccessError('End date should be greater than start date!')
 
     @api.constrains('end_datetime')
     def _check_end_datetime(self):