diff --git a/app/models/asp/payment_request_state_machine.rb b/app/models/asp/payment_request_state_machine.rb
index d54f83f44..060fef270 100644
--- a/app/models/asp/payment_request_state_machine.rb
+++ b/app/models/asp/payment_request_state_machine.rb
@@ -41,6 +41,22 @@ class PaymentRequestStateMachine
       request.schooling.student?
     end
 
+    guard_transition(to: :ready) do |request|
+      !request.student.rib.reused?
+    end
+
+    guard_transition(to: :ready) do |request|
+      request.student.rib.valid?
+    end
+
+    guard_transition(to: :ready) do |request|
+      request.pfmp.valid?
+    end
+
+    guard_transition(to: :ready) do |request|
+      !request.student.lost
+    end
+
     guard_transition(to: :ready) do |request|
       !request.student.adult_without_personal_rib?
     end
@@ -53,6 +69,12 @@ class PaymentRequestStateMachine
       request.schooling.attributive_decision.attached?
     end
 
+    guard_transition(to: :ready) do |request|
+      request.pfmp.duplicates.none? do |pfmp|
+        pfmp.in_state?(:validated)
+      end
+    end
+
     guard_transition(from: :ready, to: :sent) do |request|
       request.asp_request.present?
     end
diff --git a/app/models/pfmp.rb b/app/models/pfmp.rb
index 571133ce8..6c1d43252 100644
--- a/app/models/pfmp.rb
+++ b/app/models/pfmp.rb
@@ -112,4 +112,10 @@ def can_be_modified?
   def payment_due?
     day_count.present?
   end
+
+  def duplicates
+    student.pfmps.excluding(self).select do |other|
+      other.start_date == start_date && other.end_date == end_date
+    end
+  end
 end
diff --git a/app/models/student.rb b/app/models/student.rb
index acd88223b..e59ed09c9 100644
--- a/app/models/student.rb
+++ b/app/models/student.rb
@@ -33,6 +33,7 @@ class Student < ApplicationRecord
   scope :asp_ready, lambda {
     where(biological_sex: [1, 2])
       .where.not(address_postal_code: nil)
+      .where.not(lost: true)
       .where.not(address_country_code: %w[995 990] + [nil])
       .where.not(birthplace_country_insee_code: %w[995 990] + [nil])
       .where.not(
diff --git a/config/initializers/version.rb b/config/initializers/version.rb
index af9b4bc53..9911b865a 100644
--- a/config/initializers/version.rb
+++ b/config/initializers/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Aplypro
-  VERSION = "1.12.1"
+  VERSION = "1.13"
 end
diff --git a/spec/factories/ribs.rb b/spec/factories/ribs.rb
index 66efca41b..8abf39b3f 100644
--- a/spec/factories/ribs.rb
+++ b/spec/factories/ribs.rb
@@ -8,5 +8,9 @@
     archived_at { nil }
     name { Faker::Name.name }
     personal { Faker::Boolean.boolean }
+
+    trait :outside_sepa do
+      iban { Faker::Bank.iban(country_code: "sa") }
+    end
   end
 end
diff --git a/spec/models/asp/payment_request_state_machine_spec.rb b/spec/models/asp/payment_request_state_machine_spec.rb
index d20dbc527..2313d1f2a 100644
--- a/spec/models/asp/payment_request_state_machine_spec.rb
+++ b/spec/models/asp/payment_request_state_machine_spec.rb
@@ -9,6 +9,12 @@
 
   it { is_expected.to be_in_state :pending }
 
+  shared_examples "a blocked request" do
+    it "cannot transition to ready" do
+      expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
+    end
+  end
+
   describe "mark_ready!" do
     let(:asp_payment_request) { create(:asp_payment_request, :sendable) }
 
@@ -29,33 +35,51 @@
     context "when the schooling status is unknown" do
       before { asp_payment_request.schooling.update!(status: nil) }
 
-      it "blocks the transition" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
-      end
+      it_behaves_like "a blocked request"
     end
 
     context "when the schooling is for an apprentice" do
       before { asp_payment_request.schooling.update!(status: :apprentice) }
 
-      it "blocks the transition" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
-      end
+      it_behaves_like "a blocked request"
+    end
+
+    context "when the student is a lost record" do
+      before { asp_payment_request.student.update!(lost: true) }
+
+      it_behaves_like "a blocked request"
+    end
+
+    context "when the RIB has been reused somewhere else" do
+      before { create(:rib, iban: asp_payment_request.student.rib.iban) }
+
+      it_behaves_like "a blocked request"
+    end
+
+    # rubocop:disable Rails/SkipsModelValidations
+    context "when the PFMP is not valid" do
+      before { asp_payment_request.pfmp.update_column(:start_date, Date.new(2002, 1, 1)) }
+
+      it_behaves_like "a blocked request"
     end
 
+    context "when the rib is not valid" do
+      before { asp_payment_request.student.rib.update_columns(attributes_for(:rib, :outside_sepa)) }
+
+      it_behaves_like "a blocked request"
+    end
+    # rubocop:enable Rails/SkipsModelValidations
+
     context "when the request is missing information" do
       before { student.rib&.destroy }
 
-      it "blocks the transition" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
-      end
+      it_behaves_like "a blocked request"
     end
 
     context "when the PFMP is zero-amount" do
       before { asp_payment_request.pfmp.update!(amount: 0) }
 
-      it "raises an error" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
-      end
+      it_behaves_like "a blocked request"
     end
 
     context "when the request belongs to a student over 18 with an external rib" do
@@ -64,18 +88,38 @@
         student.rib.update!(personal: false)
       end
 
-      it "blocks the transition" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
-      end
+      it_behaves_like "a blocked request"
     end
 
     context "when the attributive decision has not been attached" do
-      before do
-        asp_payment_request.pfmp.schooling.attributive_decision.detach
+      before { asp_payment_request.pfmp.schooling.attributive_decision.detach }
+
+      it_behaves_like "a blocked request"
+    end
+
+    context "when there is another duplicated PFMP" do
+      let(:duplicate) do
+        pfmp = asp_payment_request.pfmp
+
+        create(
+          :pfmp,
+          schooling: pfmp.schooling,
+          start_date: pfmp.start_date,
+          end_date: pfmp.end_date,
+          day_count: pfmp.day_count
+        )
+      end
+
+      context "when it is validated" do
+        before { duplicate.validate! }
+
+        it_behaves_like "a blocked request"
       end
 
-      it "blocks the transition" do
-        expect { asp_payment_request.mark_ready! }.to raise_error Statesman::GuardFailedError
+      context "when it's not validated" do
+        it "allows the transition" do
+          expect { asp_payment_request.mark_ready! }.not_to raise_error
+        end
       end
     end
   end