diff --git a/extra/xapian_indexer.rb b/extra/xapian_indexer.rb
index 542a8f03..7e632a07 100644
--- a/extra/xapian_indexer.rb
+++ b/extra/xapian_indexer.rb
@@ -41,7 +41,7 @@ OMINDEX = '/usr/bin/omindex'
 # OMINDEX += " --filter=image/jpeg:'tesseract -l chi_sim+chi_tra %f -'"
 
 # Directory containing Xapian databases for omindex (Attachments indexing)
-DBROOTPATH = File.expand_path('dmsf_index', REDMINE_ROOT)
+db_root_path = File.expand_path('dmsf_index', REDMINE_ROOT)
 
 # Verbose output, false/true
 verbose = false
@@ -72,6 +72,9 @@ optparse = OptionParser.new do |opts|
   opts.separator('')
   opts.separator('')
   opts.separator('Options:')
+  opts.on('-d', '--index_db DB_PATH', 'Absolute path to index database according plugin settings in UI') do |db|
+    db_root_path = db
+  end
   opts.on('-s', '--stemming_lang a,b,c', Array, 'Comma separated list of stemming languages for indexing') do |s|
     stem_langs = s
   end
@@ -104,6 +107,7 @@ optparse = OptionParser.new do |opts|
   opts.separator('')
   opts.separator('Examples:')
   opts.separator('  xapian_indexer.rb -s english,italian -v')
+  opts.separator('  xapian_indexer.rb -d $HOME/index_db -s english,italian -v')
   opts.separator('')
   opts.summary_width = 25
 end
@@ -142,7 +146,7 @@ begin
       warn "'#{filespath}' doesn't exist."
       exit 1
     end
-    databasepath = File.join(DBROOTPATH, lang)
+    databasepath = File.join(db_root_path, lang)
     unless File.directory?(databasepath)
       log "#{databasepath} does not exist, creating ...", verbose
       FileUtils.mkdir_p databasepath
diff --git a/lib/redmine_dmsf.rb b/lib/redmine_dmsf.rb
index 5029e38b..ab807695 100644
--- a/lib/redmine_dmsf.rb
+++ b/lib/redmine_dmsf.rb
@@ -40,6 +40,7 @@ require "#{File.dirname(__FILE__)}/redmine_dmsf/patches/pdf_patch"
 require "#{File.dirname(__FILE__)}/redmine_dmsf/patches/access_control_patch"
 require "#{File.dirname(__FILE__)}/redmine_dmsf/patches/search_patch"
 require "#{File.dirname(__FILE__)}/redmine_dmsf/patches/search_controller_patch"
+require "#{File.dirname(__FILE__)}/redmine_dmsf/patches/custom_field_patch"
 
 # A workaround for obsolete 'alias_method' usage in RedmineUp's plugins
 if RedmineDmsf::Plugin.an_obsolete_plugin_present?
diff --git a/lib/redmine_dmsf/patches/custom_field_patch.rb b/lib/redmine_dmsf/patches/custom_field_patch.rb
new file mode 100644
index 00000000..aef6c39c
--- /dev/null
+++ b/lib/redmine_dmsf/patches/custom_field_patch.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module RedmineDmsf
+  module Patches
+    # CustomField patch
+    module CustomFieldPatch
+      def self.included(base)
+        base.class_eval do
+          safe_attributes :dmsf_not_inheritable
+        end
+      end
+    end
+  end
+end
+
+# Apply patch
+if Redmine::Plugin.installed?('easy_extensions')
+  RedmineExtensions::PatchManager.register_model_patch 'CustomField', 'RedmineDmsf::Patches::CustomFieldPatch'
+else
+  CustomField.include RedmineDmsf::Patches::CustomFieldPatch
+end
diff --git a/test/unit/custom_field_path_test.rb b/test/unit/custom_field_path_test.rb
new file mode 100644
index 00000000..3110b678
--- /dev/null
+++ b/test/unit/custom_field_path_test.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require File.expand_path('../../test_helper', __FILE__)
+
+# CustomField patch test
+class CustomFieldTest < RedmineDmsf::Test::UnitTest
+  def test_should_have_dmsf_not_inheritable_listed_as_safe_attribute
+    assert CustomField.new.safe_attribute_names.include?('dmsf_not_inheritable')
+  end
+end