bug fix

test/dummy/app/controllers/workflows/instances/tokens_controller.rb

@@ -12,6 +12,7 @@ module Workflows
 
     # POST /workflows/1/tokens/1/fire
     def show
+      @transition_valid = @token.place.output_transition.options.valid?
       @form_record = @virtual_model.load(@instance.payload)
     end
 
@@ -20,7 +21,10 @@ module Workflows
       @form_record = @virtual_model.load(@instance.payload)
       @form_record.assign_attributes(form_record_params)
 
-      if @form_record.valid?
+      @transition_valid = @token.place.output_transition.options.valid?
+
+      if @form_record.valid? && @transition_valid
+
         @instance.update! payload: (@instance.payload || {}).merge(@form_record.serializable_hash)
         @token.place.output_transition.fire(@token)
 

test/dummy/app/models/transitions/parallel_split.rb

@@ -12,9 +12,5 @@ class Transitions::ParallelSplit < Transition
     def auto_forwardable?
       true
     end
-
-    def options_configurable?
-      false
-    end
   end
 end

test/dummy/app/views/workflows/instances/tokens/show.html.erb

 <div class="section">
   <div class="container">
+    <% unless @transition_valid %>
+      <div class="notification is-danger">
+        The transition are not configure properly,
+        please <%= link_to "repair it", edit_workflow_transition_options_path(@workflow, @token.place.output_transition) %>.
+      </div>
+    <% end %>
+
     <%= render "_form_core/render/form",
                form: @form, instance: @form_record,
                options: {scope: :form_record, url: workflow_instance_token_fire_path(@workflow, @instance, @token), local: true} %>