diff --git a/cor_custom/views/project_view.xml b/cor_custom/views/project_view.xml
index d709382..bb4d10a 100755
--- a/cor_custom/views/project_view.xml
+++ b/cor_custom/views/project_view.xml
@@ -160,8 +160,8 @@
             </xpath>
             <xpath expr="//field[@name='partner_id']" position="replace">
                 <field name="partner_id" string="Client" required="0" groups="project.group_project_manager"/>
-                <field name="date_start" groups="project.group_project_manager"/>
-                <field name="date" groups="project.group_project_manager"/>
+                <field name="date_start" groups="project.group_project_manager" required="1"/>
+                <field name="date" groups="project.group_project_manager" required="1"/>
             </xpath>
            <!-- <xpath expr="//page[@name='settings']" position="after">
                 <page string="Consultant Allocation" groups="project.group_project_manager"
diff --git a/cor_custom/wizard/project_resource_wizard.py b/cor_custom/wizard/project_resource_wizard.py
index be824c0..f05b7cc 100755
--- a/cor_custom/wizard/project_resource_wizard.py
+++ b/cor_custom/wizard/project_resource_wizard.py
@@ -1,4 +1,4 @@
-from odoo import api, fields, models
+from odoo import api, fields, models, _
 from odoo.exceptions import UserError, AccessError, ValidationError
 from datetime import datetime, timedelta
 from dateutil import relativedelta
@@ -25,7 +25,6 @@ class ProjectResourceWizard(models.TransientModel):
     project_id = fields.Many2one('project.project')
     add_project_resource = fields.One2many('project.resource.line', 'wizard_id')
 
-
     def action_add_project_lines(self):
         record = self.env['project.sale.line.employee.map']
         for val in self.add_project_resource:
@@ -85,3 +84,13 @@ class ProjectResourceLine(models.Model):
     def onchange_start_date(self):
         if self.start_date:
             self.end_date = self.start_date + relativedelta.relativedelta(months=1) - relativedelta.relativedelta(days=1)
+        if self.start_date and self.end_date and (self.end_date > self.start_date):
+            raise AccessError('End date could not be greater than start date')
+
+    @api.onchange('start_date', 'end_date')
+    def _onchange_start_date(self):
+        if self.project_id:
+            if self.start_date and not self.project_id.date_start <= self.start_date <= self.project_id.date:
+                raise AccessError(_('Allocation Start date must be between %s to %s') % (self.project_id.date_start,self.project_id.date))
+            if self.end_date and not (self.project_id.date_start <= self.end_date <= self.project_id.date):
+                raise AccessError(_('Allocation Start date must be between %s to %s') % (self.project_id.date_start,self.project_id.date))