diff --git a/app/models/dialog_field_tag_control.rb b/app/models/dialog_field_tag_control.rb
index 6342427b264..b69e8d4bafb 100644
--- a/app/models/dialog_field_tag_control.rb
+++ b/app/models/dialog_field_tag_control.rb
@@ -29,6 +29,10 @@ def force_single_value=(setting)
     options[:force_single_value] = setting
   end
 
+  def force_multi_value
+    !single_value?
+  end
+
   def self.allowed_tag_categories
     tag_cats = Classification.where(:show => true, :parent_id => 0, :read_only => false).includes(:tag).to_a
 
diff --git a/spec/models/dialog_field_tag_control_spec.rb b/spec/models/dialog_field_tag_control_spec.rb
index 42efa99e6b9..9eaae843236 100644
--- a/spec/models/dialog_field_tag_control_spec.rb
+++ b/spec/models/dialog_field_tag_control_spec.rb
@@ -36,6 +36,13 @@ def add_entry(cat, options)
       expect(@df.single_value?).to be_truthy
     end
 
+    it "#force_multi_value" do
+      expect(@df.force_multi_value).to be_truthy
+
+      @df.force_single_value = true
+      expect(@df.force_multi_value).to be_falsey
+    end
+
     it "#automate_key_name" do
       expect(@df.automate_key_name).to eq("Array::dialog_#{@df.name}")
     end