diff --git a/app/models/ext_management_system.rb b/app/models/ext_management_system.rb
index 08d4a0f43d4..91315dd8c8f 100644
--- a/app/models/ext_management_system.rb
+++ b/app/models/ext_management_system.rb
@@ -84,6 +84,9 @@ def self.api_allowed_attributes
   has_many :service_offerings, :foreign_key => :ems_id, :dependent => :destroy, :inverse_of => :ext_management_system
   has_many :service_parameters_sets, :foreign_key => :ems_id, :dependent => :destroy, :inverse_of => :ext_management_system
 
+  has_many :host_conversion_hosts, :through => :hosts, :source => :conversion_host
+  has_many :vm_conversion_hosts, :through => :vms, :source => :conversion_host
+
   validates :name,     :presence => true, :uniqueness => {:scope => [:tenant_id]}
   validates :hostname, :presence => true, :if => :hostname_required?
   validate :hostname_uniqueness_valid?, :hostname_format_valid?, :if => :hostname_required?
@@ -611,6 +614,10 @@ def vm_log_user_event(_vm, user_event)
     $log.warn("User event logging is not available on [#{self.class.name}] Name:[#{name}]")
   end
 
+  def conversion_hosts
+    host_conversion_hosts + vm_conversion_hosts
+  end
+
   #
   # Metric methods
   #
diff --git a/app/models/service_template_transformation_plan_request.rb b/app/models/service_template_transformation_plan_request.rb
index 8a3c38c085a..73b26083696 100644
--- a/app/models/service_template_transformation_plan_request.rb
+++ b/app/models/service_template_transformation_plan_request.rb
@@ -15,6 +15,14 @@ def source_vms
     vm_resources.where(:status => [ServiceResource::STATUS_QUEUED, ServiceResource::STATUS_FAILED]).pluck(:resource_id)
   end
 
+  def validate_conversion_hosts
+    transformation_mapping.transformation_mapping_items.select do |item|
+      %w(EmsCluster CloudTenant).include?(item.source_type)
+    end.all? do |item|
+      item.destination.ext_management_system.conversion_hosts.present?
+    end
+  end
+
   def validate_vm(_vm_id)
     # TODO: enhance the logic to determine whether this VM can be included in this request
     true
diff --git a/spec/models/service_template_transformation_plan_request_spec.rb b/spec/models/service_template_transformation_plan_request_spec.rb
index d9c718958dd..f611017466d 100644
--- a/spec/models/service_template_transformation_plan_request_spec.rb
+++ b/spec/models/service_template_transformation_plan_request_spec.rb
@@ -5,6 +5,7 @@
       ServiceResource.new(:resource => vm, :status => status)
     end
   end
+
   let(:plan) { FactoryGirl.create(:service_template_transformation_plan, :service_resources => vm_requests) }
   let(:request) { FactoryGirl.create(:service_template_transformation_plan_request, :source => plan) }
 
@@ -28,6 +29,116 @@
     end
   end
 
+  describe '#validate_conversion_hosts' do
+    context 'no conversion host exists in EMS' do
+      let(:dst_ems) { FactoryGirl.create(:ext_management_system) }
+      let(:src_cluster) { FactoryGirl.create(:ems_cluster) }
+      let(:dst_cluster) { FactoryGirl.create(:ems_cluster, :ext_management_system => dst_ems) }
+
+      let(:mapping) do
+        FactoryGirl.create(
+          :transformation_mapping,
+          :transformation_mapping_items => [TransformationMappingItem.new(:source => src_cluster, :destination => dst_cluster)]
+        )
+      end
+
+      let(:catalog_item_options) do
+        {
+          :name        => 'Transformation Plan',
+          :description => 'a description',
+          :config_info => {
+            :transformation_mapping_id => mapping.id,
+            :actions                   => [
+              {:vm_id => vms.first.id.to_s, :pre_service => false, :post_service => false},
+              {:vm_id => vms.last.id.to_s, :pre_service => false, :post_service => false},
+            ],
+          }
+        }
+      end
+
+      let(:plan) { ServiceTemplateTransformationPlan.create_catalog_item(catalog_item_options) }
+      let(:request) { FactoryGirl.create(:service_template_transformation_plan_request, :source => plan) }
+
+      it 'returns false' do
+        host = FactoryGirl.create(:host, :ext_management_system => FactoryGirl.create(:ext_management_system, :zone => FactoryGirl.create(:zone)))
+        conversion_host = FactoryGirl.create(:conversion_host, :resource => host)
+        expect(request.validate_conversion_hosts).to be false
+      end
+    end
+
+    context 'conversion host exists in EMS and resource is a Host' do
+      let(:dst_ems) { FactoryGirl.create(:ems_redhat) }
+      let(:src_cluster) { FactoryGirl.create(:ems_cluster) }
+      let(:dst_cluster) { FactoryGirl.create(:ems_cluster, :ext_management_system => dst_ems) }
+
+      let(:mapping) do
+        FactoryGirl.create(
+          :transformation_mapping,
+          :transformation_mapping_items => [TransformationMappingItem.new(:source => src_cluster, :destination => dst_cluster)]
+        )
+      end
+
+      let(:catalog_item_options) do
+        {
+          :name        => 'Transformation Plan',
+          :description => 'a description',
+          :config_info => {
+            :transformation_mapping_id => mapping.id,
+            :actions                   => [
+              {:vm_id => vms.first.id.to_s, :pre_service => false, :post_service => false},
+              {:vm_id => vms.last.id.to_s, :pre_service => false, :post_service => false},
+            ],
+          }
+        }
+      end
+
+      let(:plan) { ServiceTemplateTransformationPlan.create_catalog_item(catalog_item_options) }
+      let(:request) { FactoryGirl.create(:service_template_transformation_plan_request, :source => plan) }
+
+      it 'returns true' do
+        host = FactoryGirl.create(:host, :ext_management_system => dst_ems, :ems_cluster => dst_cluster)
+        conversion_host = FactoryGirl.create(:conversion_host, :resource => host)
+        expect(request.validate_conversion_hosts).to be true
+      end
+    end
+
+    context 'conversion host exists in EMS and resource is a Vm' do
+      let(:dst_ems) { FactoryGirl.create(:ems_openstack) }
+      let(:src_cluster) { FactoryGirl.create(:ems_cluster) }
+      let(:dst_cloud_tenant) { FactoryGirl.create(:cloud_tenant, :ext_management_system => dst_ems) }
+
+      let(:mapping) do
+        FactoryGirl.create(
+          :transformation_mapping,
+          :transformation_mapping_items => [TransformationMappingItem.new(:source => src_cluster, :destination => dst_cloud_tenant)]
+        )
+      end
+
+      let(:catalog_item_options) do
+        {
+          :name        => 'Transformation Plan',
+          :description => 'a description',
+          :config_info => {
+            :transformation_mapping_id => mapping.id,
+            :actions                   => [
+              {:vm_id => vms.first.id.to_s, :pre_service => false, :post_service => false},
+              {:vm_id => vms.last.id.to_s, :pre_service => false, :post_service => false},
+            ],
+          }
+        }
+      end
+
+      let(:plan) { ServiceTemplateTransformationPlan.create_catalog_item(catalog_item_options) }
+      let(:request) { FactoryGirl.create(:service_template_transformation_plan_request, :source => plan) }
+
+      it 'returns true' do
+        vm = FactoryGirl.create(:vm_openstack, :ext_management_system => dst_ems, :cloud_tenant => dst_cloud_tenant)
+        conversion_host = FactoryGirl.create(:conversion_host, :resource => vm)
+        expect(request.validate_conversion_hosts).to be true
+      end
+    end
+  end
+
   describe '#validate_vm' do
     it { expect(request.validate_vm(vms[0].id)).to be_truthy }
   end