diff --git a/app/models/dmsf_file_revision.rb b/app/models/dmsf_file_revision.rb
index 7002f454..46b31d45 100644
--- a/app/models/dmsf_file_revision.rb
+++ b/app/models/dmsf_file_revision.rb
@@ -265,6 +265,15 @@ class DmsfFileRevision < ApplicationRecord
     wf.assign(id) if wf && id
   end
 
+  def reset_workflow
+    self.workflow = nil
+    self.dmsf_workflow_id = nil
+    self.dmsf_workflow_assigned_by_user_id = nil
+    self.dmsf_workflow_assigned_at = nil
+    self.dmsf_workflow_started_by_user_id = nil
+    self.dmsf_workflow_started_at = nil
+  end
+
   def increase_version(version_to_increase)
     # Patch version
     self.patch_version = case version_to_increase
diff --git a/lib/redmine_dmsf/webdav/dmsf_resource.rb b/lib/redmine_dmsf/webdav/dmsf_resource.rb
index ec01d7cd..406cc568 100644
--- a/lib/redmine_dmsf/webdav/dmsf_resource.rb
+++ b/lib/redmine_dmsf/webdav/dmsf_resource.rb
@@ -562,6 +562,7 @@ module RedmineDmsf
           else
             if last_revision
               new_revision = last_revision.dup
+              new_revision.reset_workflow
               new_revision.source_revision = last_revision
             else
               new_revision = DmsfFileRevision.new
diff --git a/test/unit/dmsf_file_revision_test.rb b/test/unit/dmsf_file_revision_test.rb
index b4963800..1ed4f03d 100644
--- a/test/unit/dmsf_file_revision_test.rb
+++ b/test/unit/dmsf_file_revision_test.rb
@@ -316,4 +316,27 @@ class DmsfFileRevisionTest < RedmineDmsf::Test::UnitTest
     assert h.is_a?(Hash)
     assert_nil h['90']
   end
+
+  def test_set_workflow
+    @revision2.set_workflow @wf1.id, 'assign'
+    assert_equal DmsfWorkflow::STATE_ASSIGNED, @revision2.workflow
+    assert_equal User.current, @revision2.dmsf_workflow_assigned_by_user
+    assert @revision2.dmsf_workflow_assigned_at
+    @revision2.set_workflow @wf1.id, 'start'
+    assert_equal DmsfWorkflow::STATE_WAITING_FOR_APPROVAL, @revision2.workflow
+    assert_equal User.current, @revision2.dmsf_workflow_started_by_user
+    assert @revision2.dmsf_workflow_started_at
+  end
+
+  def test_reset_workflow
+    @revision2.set_workflow @wf1.id, 'assign'
+    @revision2.set_workflow @wf1.id, 'start'
+    @revision2.reset_workflow
+    assert_nil @revision2.workflow
+    assert_nil @revision2.dmsf_workflow_id
+    assert_nil @revision2.dmsf_workflow_assigned_by_user_id
+    assert_nil @revision2.dmsf_workflow_assigned_at
+    assert_nil @revision2.dmsf_workflow_started_by_user_id
+    assert_nil @revision2.dmsf_workflow_started_at
+  end
 end