diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index ec972a7c0..276a90183 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -205,6 +205,10 @@ class Procedure < ApplicationRecord
     [:notice, :deliberation].each { |attachment| clone_attachment(procedure, attachment) }
 
     procedure.types_de_champ += PiecesJustificativesService.types_pj_as_types_de_champ(self)
+    if is_different_admin || from_library
+      procedure.types_de_champ.each { |tdc| tdc.options&.delete(:old_pj) }
+    end
+
     procedure.administrateur = admin
     procedure.initiated_mail = initiated_mail&.dup
     procedure.received_mail = received_mail&.dup
diff --git a/spec/models/procedure_spec.rb b/spec/models/procedure_spec.rb
index 4cafa657a..f69fffc46 100644
--- a/spec/models/procedure_spec.rb
+++ b/spec/models/procedure_spec.rb
@@ -409,6 +409,12 @@ describe Procedure do
       it 'should set service_id to nil' do
         expect(subject.service).to eq(nil)
       end
+
+      it 'should discard old pj information' do
+        subject.types_de_champ.each do |stc|
+          expect(stc.old_pj).to be_nil
+        end
+      end
     end
 
     it 'should keep service_id' do
@@ -423,6 +429,12 @@ describe Procedure do
         expect(subject.service.administrateur_id).not_to eq(service.administrateur_id)
         expect(subject.service.attributes.except("id", "administrateur_id", "created_at", "updated_at")).to eq(service.attributes.except("id", "administrateur_id", "created_at", "updated_at"))
       end
+
+      it 'should discard old pj information' do
+        subject.types_de_champ.each do |stc|
+          expect(stc.old_pj).to be_nil
+        end
+      end
     end
 
     it 'should duplicate existing mail_templates' do