diff --git a/app/models/service_template.rb b/app/models/service_template.rb
index 59e2bc71278..a04315b13bd 100644
--- a/app/models/service_template.rb
+++ b/app/models/service_template.rb
@@ -86,7 +86,13 @@ class ServiceTemplate < ApplicationRecord
   scope :displayed,                                 ->         { where(:display => true) }
   scope :public_service_templates,                  ->         { where(:internal => [false, nil]) }
 
-  supports :order
+  supports :order do
+    unsupported_reason_add(:order, 'Service template does not belong to a service catalog') unless service_template_catalog
+    unsupported_reason_add(:order, 'Service template is not configured to be displayed') unless display
+  end
+  alias orderable?     supports_order?
+  alias validate_order supports_order?
+
 
   def self.with_tenant(tenant_id)
     tenant = Tenant.find(tenant_id)
@@ -352,11 +358,6 @@ def validate_template
     end.try(:resource).try(:validate_template) || {:valid => true, :message => nil}
   end
 
-  def validate_order
-    service_template_catalog && display
-  end
-  alias orderable? validate_order
-
   def provision_action
     resource_actions.find_by(:action => "Provision")
   end
@@ -428,7 +429,8 @@ def order(user_or_id, options = nil, request_options = {}, schedule_time = nil)
       time = Time.parse(schedule_time).utc
 
       errors = workflow.validate_dialog
-      return {:errors => errors} unless errors.blank?
+      errors << unsupported_reason(:order)
+      return {:errors => errors} if errors.compact.present?
 
       schedule = MiqSchedule.create!(
         :name         => "Order #{self.class.name} #{id} at #{time}",
diff --git a/app/models/service_template_transformation_plan.rb b/app/models/service_template_transformation_plan.rb
index 64c2b545566..2eed062c7c8 100644
--- a/app/models/service_template_transformation_plan.rb
+++ b/app/models/service_template_transformation_plan.rb
@@ -1,6 +1,14 @@
 class ServiceTemplateTransformationPlan < ServiceTemplate
   include_concern 'ValidateConfigInfo'
   virtual_has_one :transformation_mapping
+
+  supports :order do
+    unmigrated_vms = vm_resources.reject { |res| res.resource.is_tagged_with?('transformation_status/migrated', :ns => '/managed') }
+    unsupported_reason_add(:order, 'All VMs of the migration plan have already been successfully migrated') if unmigrated_vms.blank?
+  end
+  alias orderable?     supports_order?
+  alias validate_order supports_order?
+
   def request_class
     ServiceTemplateTransformationPlanRequest
   end
@@ -23,12 +31,6 @@ def transformation_mapping_resource
     service_resources.where(:resource_type => 'TransformationMapping')
   end
 
-  def validate_order
-    # Service template should not be orderable if all VMs have already been migrated
-    vm_resources.reject { |res| res.resource.is_tagged_with?('transformation_status/migrated', :ns => '/managed') }.present?
-  end
-  alias orderable? validate_order
-
   def self.default_provisioning_entry_point(_service_type)
     '/Transformation/StateMachines/VMTransformation/Transformation'
   end
diff --git a/spec/models/service_template_spec.rb b/spec/models/service_template_spec.rb
index 3d8563fa218..482549cd908 100644
--- a/spec/models/service_template_spec.rb
+++ b/spec/models/service_template_spec.rb
@@ -915,7 +915,8 @@
   context "#order" do
     let(:user) { FactoryBot.create(:user) }
     let(:resource_action) { FactoryBot.create(:resource_action, :action => "Provision") }
-    let(:service_template) { FactoryBot.create(:service_template, :resource_actions => [resource_action]) }
+    let(:service_template_catalog) { FactoryBot.create(:service_template_catalog) }
+    let(:service_template) { FactoryBot.create(:service_template, :resource_actions => [resource_action], :service_template_catalog => service_template_catalog, :display => true) }
     let(:resource_action_options) { {:target => service_template, :initiator => 'control', :submit_workflow => true} }
     let(:miq_request) { FactoryBot.create(:service_template_provision_request) }
     let!(:resource_action_workflow) { ResourceActionWorkflow.new({}, user, resource_action, resource_action_options) }
@@ -1115,9 +1116,19 @@
   end
 
   context "#supports_order?" do
-    it "returns the expected boolean value" do
-      st = FactoryBot.create(:service_template)
-      expect(st.supports_order?).to eql(true)
+    context 'when service_template cannot be displayed' do
+      it "returns the expected boolean value" do
+        st = FactoryBot.create(:service_template, :service_template_catalog => FactoryBot.create(:service_template_catalog), :display => false)
+        expect(st.supports_order?).to eql(false)
+        expect(st.unsupported_reason(:order)).to eq('Service template is not configured to be displayed')
+      end
+    end
+
+    context 'when service_template can be displayed' do
+      it "returns the expected boolean value" do
+        st = FactoryBot.create(:service_template, :service_template_catalog => FactoryBot.create(:service_template_catalog), :display => true)
+        expect(st.supports_order?).to eql(true)
+      end
     end
   end
 end
diff --git a/spec/models/service_template_transformation_plan_spec.rb b/spec/models/service_template_transformation_plan_spec.rb
index 8b469c426c3..d1576576a4d 100644
--- a/spec/models/service_template_transformation_plan_spec.rb
+++ b/spec/models/service_template_transformation_plan_spec.rb
@@ -107,15 +107,16 @@
     let(:service_template) { described_class.create_catalog_item(catalog_item_options) }
 
     it 'allows a plan to be ordered if all VMs have not been migrated' do
-      expect(service_template.validate_order).to be_truthy
-      expect(service_template.orderable?).to be_truthy # alias
+      expect(service_template.validate_order).to eql(true)
+      expect(service_template.orderable?).to eql(true) # alias
     end
 
     it 'denies a plan from bring ordered if all VMs have been migrated' do
       vm1.tag_add('transformation_status/migrated', :ns => '/managed')
       vm2.tag_add('transformation_status/migrated', :ns => '/managed')
-      expect(service_template.validate_order).to be_falsey
-      expect(service_template.orderable?).to be_falsey # alias
+      expect(service_template.validate_order).to eql(false)
+      expect(service_template.orderable?).to eql(false) # alias
+      expect(service_template.unsupported_reason(:order)).to eq('All VMs of the migration plan have already been successfully migrated')
     end
   end