diff --git a/app/assets/stylesheets/custom/student_enrollment.scss b/app/assets/stylesheets/custom/student_enrollment.scss
index 96620d71..58af7243 100644
--- a/app/assets/stylesheets/custom/student_enrollment.scss
+++ b/app/assets/stylesheets/custom/student_enrollment.scss
@@ -32,6 +32,11 @@
   border-color: rgb(1, 104, 1);
 }
 
+.background-held{
+  background-color: #b188b8;
+  border-color: purple;
+}
+
 .show-box summary {
   margin-top: 0;
   margin-bottom: 10px;
diff --git a/app/controllers/class_enrollment_requests_controller.rb b/app/controllers/class_enrollment_requests_controller.rb
index a5343ab1..0ab0e192 100644
--- a/app/controllers/class_enrollment_requests_controller.rb
+++ b/app/controllers/class_enrollment_requests_controller.rb
@@ -236,7 +236,8 @@ def set_status(status, message)
         yield record if block_given?
         flash[:info] = I18n.t(message, count: 1)
       else
-        flash[:error] = I18n.t(message, count: 0)
+        flash[:info] = (I18n.t(message, count: 0))
+        flash[:error] = record.errors.full_messages
       end
     end
   end
diff --git a/app/controllers/research_lines_controller.rb b/app/controllers/research_lines_controller.rb
index 379c7096..07295c7c 100644
--- a/app/controllers/research_lines_controller.rb
+++ b/app/controllers/research_lines_controller.rb
@@ -26,6 +26,7 @@ class ResearchLinesController < ApplicationController
     config.columns = [:name, :research_area, :professor_research_lines, :available]
     config.columns[:research_area].form_ui = :record_select
     config.list.columns = [:name, :research_area, :available]
+    config.show.columns = [:name, :research_area, :professors, :courses, :available]
 
     config.actions.exclude :deleted_records
   end
diff --git a/app/models/class_enrollment.rb b/app/models/class_enrollment.rb
index 57d5172b..26a1e329 100644
--- a/app/models/class_enrollment.rb
+++ b/app/models/class_enrollment.rb
@@ -39,6 +39,7 @@ class ClassEnrollment < ApplicationRecord
   validate :check_multiple_class_enrollment_allowed
   validate :professor_changed_only_valid_fields,
     if: -> { can?(:post_grades, self) && cannot?(:update_all_fields, self) }
+  validate :check_enrollment_hold
 
   after_save :notify_student_and_advisor
   after_save :class_enrollment_request_cascade
@@ -129,6 +130,12 @@ def should_send_email_to_professor?
     )
   end
 
+  def check_enrollment_hold
+    if self.course_class && EnrollmentHold.hold_in_date(enrollment, self.course_class.start_date, self.course_class.end_date)
+      errors.add(:enrollment, :enrollment_is_held)
+    end
+  end
+
   private
     def grade_for_situation
       if course_has_grade
diff --git a/app/models/class_enrollment_request.rb b/app/models/class_enrollment_request.rb
index 6d5daacf..b647ed2f 100644
--- a/app/models/class_enrollment_request.rb
+++ b/app/models/class_enrollment_request.rb
@@ -61,6 +61,7 @@ class ClassEnrollmentRequest < ApplicationRecord
     if: -> { !student_saving && !marked_for_destruction? }
   validate :that_course_class_does_not_exist_in_a_class_enrollment,
     if: -> { !marked_for_destruction? }
+  validate :check_enrollment_hold
 
   before_validation :create_or_destroy_class_enrollment, on: %i[create update]
   after_save :destroy_or_create_class_enrollment
@@ -126,6 +127,12 @@ def remove_not_effected?
     self.status != ClassEnrollmentRequest::EFFECTED
   end
 
+  def check_enrollment_hold
+    if self.course_class && EnrollmentHold.hold_in_date(enrollment, self.course_class.start_date, self.course_class.end_date)
+      errors.add(:enrollment, :enrollment_is_held)
+    end
+  end
+
   protected
     def that_class_enrollment_matches_course_and_enrollment
       ce = self.class_enrollment
diff --git a/app/models/course_class.rb b/app/models/course_class.rb
index a0746029..d0403069 100644
--- a/app/models/course_class.rb
+++ b/app/models/course_class.rb
@@ -50,6 +50,16 @@ def label_with_course
     "#{self.course.name}#{name_l} - #{year}/#{semester}"
   end
 
+  def start_date
+    ys = YearSemester.new(year: year, semester: semester)
+    ys.semester_begin
+  end
+
+  def end_date
+    ys = YearSemester.new(year: year, semester: semester)
+    ys.semester_end
+  end
+
   def class_enrollments_count
     self.class_enrollments.count
   end
diff --git a/app/models/enrollment_hold.rb b/app/models/enrollment_hold.rb
index ba6719c1..5a5ec056 100644
--- a/app/models/enrollment_hold.rb
+++ b/app/models/enrollment_hold.rb
@@ -17,6 +17,8 @@ class EnrollmentHold < ApplicationRecord
 
   validate :validate_dates
 
+  validate :verify_class_enrollments
+
   after_commit :create_phase_completions
 
   def to_label
@@ -61,4 +63,24 @@ def end_date
   def create_phase_completions
     enrollment.create_phase_completions
   end
+
+  def verify_class_enrollments
+    class_enrollments = ClassEnrollment.where(enrollment: self.enrollment)
+    class_enrollments.each do |class_enrollment|
+      course_class = class_enrollment.course_class
+      unless course_class.end_date < self.start_date || course_class.start_date > self.end_date
+        errors.add(:base, :class_enrollments_exist)
+      end
+    end
+  end
+
+  def self.hold_in_date(enrollment, course_start, course_end)
+    enrollment_holds = EnrollmentHold.where(enrollment: enrollment)
+    unless enrollment_holds.empty?
+      enrollment_holds.each do |hold|
+        return true unless course_end < hold.start_date || course_start > hold.end_date
+      end
+    end
+    false
+  end
 end
diff --git a/app/views/student_enrollment/_show_enroll.html.erb b/app/views/student_enrollment/_show_enroll.html.erb
index f420cae7..8e620b8d 100644
--- a/app/views/student_enrollment/_show_enroll.html.erb
+++ b/app/views/student_enrollment/_show_enroll.html.erb
@@ -1,19 +1,28 @@
-<div class="enrollment-show-box show-box <%= "background-#{enrollment_request.persisted? ? ClassEnrollmentRequest::STATUSES_MAP[enrollment_request.status] : 'not-persisted'}"%>"> 
-  <h3>
-    <% if semester.main_enroll_open? %>
-      <%= t "student_enrollment.show_enroll.title_main", semester:  semester.to_label %>
+<% is_held = EnrollmentHold.hold_in_date(@enrollment, semester.period_start, semester.period_end)%>
+<% unless is_held%>
+  <div class="enrollment-show-box show-box <%= "background-#{enrollment_request.persisted? ? ClassEnrollmentRequest::STATUSES_MAP[enrollment_request.status] : 'not-persisted'}"%>">
+<% else %>
+  <div class="enrollment-show-box show-box background-held">
+<% end %>
+    <h3>
+      <% if semester.main_enroll_open? %>
+        <%= t "student_enrollment.show_enroll.title_main", semester:  semester.to_label %>
+      <% else %>
+        <%= t "student_enrollment.show_enroll.title_adjust", semester:  semester.to_label %>
+      <% end %>
+    </h3>
+    <% unless is_held%>
+      <% linkpath = student_enroll_path(id: @enrollment.id, year: semester.year, semester: semester.semester) %>
+      <% if enrollment_request.persisted? %>
+        <% unread = enrollment_request.student_unread_messages %>
+        <%= link_to t("student_enrollment.show_enroll.enroll_link_edit_#{ClassEnrollmentRequest::STATUSES_MAP[enrollment_request.status]}"), linkpath %>
+        <% if unread > 0 %>
+          <%= t("student_enrollment.show_enroll.unread", count: unread) %>
+        <% end %>
+      <% else %>
+        <%= link_to t("student_enrollment.show_enroll.enroll_link_new"), linkpath %>
+      <% end %>
     <% else %>
-      <%= t "student_enrollment.show_enroll.title_adjust", semester:  semester.to_label %>
+      <p><%= t "student_enrollment.show_enroll.enrollment_is_held" %></p>
     <% end %>
-  </h3>
-  <% linkpath = student_enroll_path(id: @enrollment.id, year: semester.year, semester: semester.semester) %>
-  <% if enrollment_request.persisted? %>
-    <% unread = enrollment_request.student_unread_messages %>
-    <%= link_to t("student_enrollment.show_enroll.enroll_link_edit_#{ClassEnrollmentRequest::STATUSES_MAP[enrollment_request.status]}"), linkpath %>
-    <% if unread > 0 %>
-      <%= t("student_enrollment.show_enroll.unread", count: unread) %>
-    <% end %>
-  <% else %>
-    <%= link_to t("student_enrollment.show_enroll.enroll_link_new"), linkpath %>
-  <% end %>
-</div>
+  </div>
diff --git a/config/locales/class_enrollment.pt-BR.yml b/config/locales/class_enrollment.pt-BR.yml
index d42a7ecd..f768c099 100644
--- a/config/locales/class_enrollment.pt-BR.yml
+++ b/config/locales/class_enrollment.pt-BR.yml
@@ -30,6 +30,7 @@ pt-BR:
         student: "Aluno"
         enrollment_level: "Nível"
         enrollment_status: "Tipo de Matrícula"
+        enrollment_hold: "Matrícula Trancada"
         admission_date: "Data de Admissão"
         scholarship_durations_active: "Possui bolsa?"
         advisor: "Orientador"
@@ -51,6 +52,7 @@ pt-BR:
           grade_gt_100: "deve ser menor ou igual a 10.0"
           grade_lt_0: "deve ser maior ou igual a 0.0"
           changes_to_disallowed_fields: "houve modificação de campos não válidos"
+          enrollment_is_held: "está trancada no período da turma"
 
     models:
       class_enrollment:
diff --git a/config/locales/class_enrollment_request.pt-BR.yml b/config/locales/class_enrollment_request.pt-BR.yml
index 92f04e4e..9a517129 100644
--- a/config/locales/class_enrollment_request.pt-BR.yml
+++ b/config/locales/class_enrollment_request.pt-BR.yml
@@ -33,6 +33,7 @@ pt-BR:
           remove: "Remoção"
       class_enrollment_requests:
         course_class: Turma
+        enrollment: Matrícula
 
     errors:
       models:
@@ -43,6 +44,8 @@ pt-BR:
             course_class:
               previously_approved: "já foi cursada anteriormente com aprovação"
               taken: "duplicada"
+            enrollment:
+              enrollment_is_held: "está trancada no período"
 
     models:
       class_enrollment_request:
diff --git a/config/locales/enrollment_hold.pt-BR.yml b/config/locales/enrollment_hold.pt-BR.yml
index 08e5e4d2..0fc7afa5 100644
--- a/config/locales/enrollment_hold.pt-BR.yml
+++ b/config/locales/enrollment_hold.pt-BR.yml
@@ -19,6 +19,7 @@ pt-BR:
         enrollment_hold:
           before_admission_date: "anterior a Data de Admissão"
           after_dismissal_date: "posterior a Data de Desligamento"
+          class_enrollments_exist: "existem inscrições no período trancado"
 
     models:
       enrollment_hold:
diff --git a/config/locales/research_line.pt-BR.yml b/config/locales/research_line.pt-BR.yml
index 66295421..1442b6a0 100644
--- a/config/locales/research_line.pt-BR.yml
+++ b/config/locales/research_line.pt-BR.yml
@@ -5,7 +5,7 @@ pt-BR:
   activerecord:
     attributes:
       research_line:
-        code: "Código"
+        courses: "Disciplinas"
         name: "Nome"
         research_area: "Área de Pesquisa"
         professor_research_lines: "Professores"
diff --git a/config/locales/student_enrollment.pt-BR.yml b/config/locales/student_enrollment.pt-BR.yml
index dc93478a..186d1763 100644
--- a/config/locales/student_enrollment.pt-BR.yml
+++ b/config/locales/student_enrollment.pt-BR.yml
@@ -10,6 +10,7 @@ pt-BR:
     show_enroll:
       title_main: Inscrições em disciplinas do semestre %{semester} estão abertas!
       title_adjust: Período de ajustes do semestre %{semester} está aberto!
+      enrollment_is_held: Sua matrícula está trancada. Entre em contato com a secretaria caso queira destrancar para esta inscrição.
       enroll_link_new: Clique aqui para fazer um pedido de inscrição.
       enroll_link_edit_valid: Seu pedido de inscrição foi marcado como válido. Clique aqui para editar
       enroll_link_edit_requested: Clique aqui para editar seu pedido de inscrição.
diff --git a/spec/factories/factory_enrollment.rb b/spec/factories/factory_enrollment.rb
index 9bacc077..8d089949 100644
--- a/spec/factories/factory_enrollment.rb
+++ b/spec/factories/factory_enrollment.rb
@@ -13,6 +13,6 @@
     sequence :enrollment_number do |number|
       "M#{number}"
     end
-    admission_date { 5.days.ago.to_date }
+    admission_date { 10.days.ago.to_date }
   end
 end
diff --git a/spec/features/enrollments_spec.rb b/spec/features/enrollments_spec.rb
index 8a79cddb..0927cf8b 100644
--- a/spec/features/enrollments_spec.rb
+++ b/spec/features/enrollments_spec.rb
@@ -145,9 +145,15 @@
 
     it "should update research_line columns when research_area is chosen" do
       within("#as_#{plural_name}-create--form") do
-        expect(page.all("select#record_research_line_ option").map(&:text)).to eq ["Selecione uma opção", "Machine Learning", "Versionamento"]
+        expect(page).to have_select(
+          "record_research_line_",
+          options: ["Selecione uma opção", "Machine Learning", "Versionamento"]
+        )
         find(:select, "record_research_area_").find(:option, text: @research_area1.name).select_option
-        expect(page.all("select#record_research_line_ option").map(&:text)).to eq ["Selecione uma opção", "Machine Learning"]
+        expect(page).to have_select(
+          "record_research_line_",
+          options: ["Selecione uma opção", "Machine Learning"]
+        )
       end
     end
   end
diff --git a/spec/features/scholarship_durations_spec.rb b/spec/features/scholarship_durations_spec.rb
index 287f799b..673cd294 100644
--- a/spec/features/scholarship_durations_spec.rb
+++ b/spec/features/scholarship_durations_spec.rb
@@ -235,7 +235,7 @@
       start_month = I18n.l(2.months.ago, format: "%B")
       find(:select, "suspended_start_month").find(:option, text: start_month).select_option
 
-      end_year = 0.years.ago.year
+      end_year = 1.year.from_now.year
       find(:select, "suspended_end_year").find(:option, text: end_year.to_s).select_option
 
       end_month = I18n.l(2.months.from_now, format: "%B")
diff --git a/spec/features/student_enrollment_spec.rb b/spec/features/student_enrollment_spec.rb
index 85e946f8..436a01d6 100644
--- a/spec/features/student_enrollment_spec.rb
+++ b/spec/features/student_enrollment_spec.rb
@@ -73,14 +73,14 @@
     @destroy_all << @enrollment3 = FactoryBot.create(:enrollment, enrollment_number: "D01", student: @student1, level: @level1, enrollment_status: @enrollment_status1)
     @destroy_all << @enrollment4 = FactoryBot.create(:enrollment, enrollment_number: "D02", student: @student1, level: @level1, enrollment_status: @enrollment_status1)
 
-    @destroy_all << @course_class1 = FactoryBot.create(:course_class, name: "Algebra", course: @course1, professor: @professor1, year: 2022, semester: 1)
-    @destroy_all << @course_class2 = FactoryBot.create(:course_class, name: "Algebra", course: @course1, professor: @professor1, year: 2022, semester: 2)
-    @destroy_all << @course_class3 = FactoryBot.create(:course_class, name: "Algebra", course: @course2, professor: @professor1, year: 2021, semester: 1)
-    @destroy_all << @course_class4 = FactoryBot.create(:course_class, name: "Versionamento", course: @course3, professor: @professor2, year: 2022, semester: 2)
-    @destroy_all << @course_class5 = FactoryBot.create(:course_class, name: "Defesa", course: @course4, professor: @professor3, year: 2022, semester: 2)
-    @destroy_all << @course_class6 = FactoryBot.create(:course_class, name: "Mineração de Repositórios", course: @course5, professor: @professor2, year: 2022, semester: 2)
-    @destroy_all << @course_class7 = FactoryBot.create(:course_class, name: "Pesquisa", course: @course6, professor: @professor3, year: 2022, semester: 2)
-    @destroy_all << @course_class8 = FactoryBot.create(:course_class, name: "Programação", course: @course7, professor: @professor1, year: 2022, semester: 2)
+    @destroy_all << @course_class1 = FactoryBot.create(:course_class, name: "Algebra", course: @course1, professor: @professor1, year: 3.years.ago.year, semester: 1)
+    @destroy_all << @course_class2 = FactoryBot.create(:course_class, name: "Algebra", course: @course1, professor: @professor1, year: 3.years.ago.year, semester: 2)
+    @destroy_all << @course_class3 = FactoryBot.create(:course_class, name: "Algebra", course: @course2, professor: @professor1, year: 4.years.ago.year, semester: 1)
+    @destroy_all << @course_class4 = FactoryBot.create(:course_class, name: "Versionamento", course: @course3, professor: @professor2, year: 3.years.ago.year, semester: 2)
+    @destroy_all << @course_class5 = FactoryBot.create(:course_class, name: "Defesa", course: @course4, professor: @professor3, year: 3.years.ago.year, semester: 2)
+    @destroy_all << @course_class6 = FactoryBot.create(:course_class, name: "Mineração de Repositórios", course: @course5, professor: @professor2, year: 3.years.ago.year, semester: 2)
+    @destroy_all << @course_class7 = FactoryBot.create(:course_class, name: "Pesquisa", course: @course6, professor: @professor3, year: 3.years.ago.year, semester: 2)
+    @destroy_all << @course_class8 = FactoryBot.create(:course_class, name: "Programação", course: @course7, professor: @professor1, year: 3.years.ago.year, semester: 2)
 
     @destroy_all << FactoryBot.create(:allocation, course_class: @course_class2, day: "Segunda", start_time: 11, end_time: 13)
     @destroy_all << FactoryBot.create(:allocation, course_class: @course_class2, day: "Segunda", start_time: 14, end_time: 16)
diff --git a/spec/models/class_enrollment_request_spec.rb b/spec/models/class_enrollment_request_spec.rb
index d11cf238..41c7ccc4 100644
--- a/spec/models/class_enrollment_request_spec.rb
+++ b/spec/models/class_enrollment_request_spec.rb
@@ -155,6 +155,18 @@ def prepare_course_class(allocations, to_destroy, attributes = {})
               :must_represent_the_same_enrollment_and_class).on :class_enrollment
           end
         end
+        context "should have error enrollment_is_held when" do
+          it "enrollment has an enrollment hold conflicting the date of course_class" do
+            @destroy_later << e = FactoryBot.create(:enrollment, admission_date: 3.years.ago.at_beginning_of_month.to_date)
+            @destroy_later << cc = FactoryBot.create(:course_class, year: 1.year.ago.year, semester: 1)
+            @destroy_later << FactoryBot.create(:enrollment_hold, enrollment: e,
+            year: 2.years.ago.year, number_of_semesters: 4)
+            @destroy_later << cer = FactoryBot.create(:enrollment_request, enrollment: e)
+            class_enrollment_request.enrollment_request = cer
+            class_enrollment_request.course_class = cc
+            expect(class_enrollment_request).to have_error(:enrollment_is_held).on :enrollment
+          end
+        end
       end
     end
     describe "Methods" do
diff --git a/spec/models/class_enrollment_spec.rb b/spec/models/class_enrollment_spec.rb
index 5e887775..eb80041f 100644
--- a/spec/models/class_enrollment_spec.rb
+++ b/spec/models/class_enrollment_spec.rb
@@ -174,6 +174,17 @@
           expect(class_enrollment).to have_error(:disapproved_by_absence_for_situation_aproved).on :disapproved_by_absence
         end
       end
+      context "should have error enrollment_is_held when" do
+        it "enrollment has an enrollment hold conflicting the date of course_class" do
+          @destroy_later << e = FactoryBot.create(:enrollment, admission_date: 3.years.ago.at_beginning_of_month.to_date)
+          @destroy_later << cc = FactoryBot.create(:course_class, year: 1.year.ago.year, semester: 1)
+          @destroy_later << FactoryBot.create(:enrollment_hold, enrollment: e,
+           year: 2.years.ago.year, number_of_semesters: 4)
+          class_enrollment.enrollment = e
+          class_enrollment.course_class = cc
+          expect(class_enrollment).to have_error(:enrollment_is_held).on :enrollment
+        end
+      end
     end
   end
   describe "Methods" do
diff --git a/spec/models/enrollment_hold_spec.rb b/spec/models/enrollment_hold_spec.rb
index a322f41d..64f97978 100644
--- a/spec/models/enrollment_hold_spec.rb
+++ b/spec/models/enrollment_hold_spec.rb
@@ -60,6 +60,17 @@
           enrollment_hold.number_of_semesters = 20
           expect(enrollment_hold).to have_error(:after_dismissal_date).on :base
         end
+
+        it "exist class enrollment in enrollment hold period" do
+          @destroy_later << e = FactoryBot.create(:enrollment)
+          @destroy_later << cc = FactoryBot.create(:course_class, year: e.admission_date.year + 2)
+          @destroy_later << FactoryBot.create(:class_enrollment, enrollment: e, course_class: cc)
+          enrollment_hold.enrollment = e
+          enrollment_hold.year = e.admission_date.year + 1
+          enrollment_hold.semester = 2
+          enrollment_hold.number_of_semesters = 6
+          expect(enrollment_hold).to have_error(:class_enrollments_exist).on :base
+        end
       end
     end
   end
diff --git a/spec/support/download_helpers.rb b/spec/support/download_helpers.rb
index cc95cf5f..8b736b90 100644
--- a/spec/support/download_helpers.rb
+++ b/spec/support/download_helpers.rb
@@ -2,7 +2,7 @@
 # frozen_string_literal: true
 
 module DownloadHelpers
-  TIMEOUT = 1
+  TIMEOUT = 5
   PATH    = Rails.root.join("tmp/test_downloads")
 
   extend self
@@ -31,7 +31,7 @@ def downloaded?
   end
 
   def downloading?
-    downloads.grep(/\.part$/).any?
+    downloads.any? { |f| f.end_with?(".part", ".crdownload") }
   end
 
   def clear_downloads