diff --git a/lib/proposals_discussion_plugin/api.rb b/lib/proposals_discussion_plugin/api.rb
index e0dd4d3..182e910 100644
--- a/lib/proposals_discussion_plugin/api.rb
+++ b/lib/proposals_discussion_plugin/api.rb
@@ -23,7 +23,7 @@ class ProposalsDiscussionPlugin::API < Grape::API
       proposal_task.requestor = current_person
 
       unless proposal_task.save
-        render_api_errors!(proposal_task.article_object.errors.full_messages)
+        render_api_errors!(proposal_task.errors)
       end
       {:success => true}
       #present proposal_task, :with => Entities::Task, :fields => params[:fields]
diff --git a/lib/proposals_discussion_plugin/proposal_task.rb b/lib/proposals_discussion_plugin/proposal_task.rb
index 6dc1639..20ae82c 100644
--- a/lib/proposals_discussion_plugin/proposal_task.rb
+++ b/lib/proposals_discussion_plugin/proposal_task.rb
@@ -1,5 +1,4 @@
 class ProposalsDiscussionPlugin::ProposalTask < Task
-
   has_and_belongs_to_many :categories,
   class_name: "ProposalsDiscussionPlugin::TaskCategory",
   join_table: :proposals_discussion_plugin_task_categories,
@@ -10,9 +9,13 @@ class ProposalsDiscussionPlugin::ProposalTask < Task
 
   validates_presence_of :requestor_id, :target_id
   validates_associated :article_object
-  before_validation :simplify_abstract
+  before_save :simplify_abstract
+#  before_validation :simplify_abstract
   validate :require_category
-  validates_uniqueness_of :proposal_discussion_plugin_simplified_abstract, :scope => ['target_id'], :message => _("Cannot create duplicate proposal")
+
+  validate :unique_simplified_abstract?
+
+#  validates_uniqueness_of :proposal_discussion_plugin_simplified_abstract, :scope => ['target_id'], :message => _("Cannot create duplicate proposal")
 
   settings_items :name, :type => String
   settings_items :ip_address, :type => String
@@ -22,6 +25,10 @@ class ProposalsDiscussionPlugin::ProposalTask < Task
   settings_items :closing_statment, :article_parent_id
 
 
+  def simplify_abstract
+    self.proposal_discussion_plugin_simplified_abstract = ProposalsDiscussionPlugin::ProposalTask.simplify(self[:data][:article]["abstract"])
+  end
+
   scope :pending_evaluated, lambda { |profile, filter_type, filter_text|
     self
       .to(profile)
@@ -269,14 +276,16 @@ class ProposalsDiscussionPlugin::ProposalTask < Task
 
   protected
 
-    def simplify_abstract
-      proposal_discussion_plugin_simplified_abstract = ProposalsDiscussionPlugin::ProposalTask.simplify(self[:data][:article]["abstract"])
-    end
-
     def require_category
       if categories.count == 0 && flagged?
         errors.add :categories, _('Select at least one category')
       end
     end
 
+    def unique_simplified_abstract?
+      sa = ProposalsDiscussionPlugin::ProposalTask.simplify(self[:data][:article]["abstract"])
+      r = ProposalsDiscussionPlugin::ProposalTask.find_by_sql ["SELECT 1 AS one FROM tasks WHERE tasks.type IN ('ProposalsDiscussionPlugin::ProposalTask') AND (tasks.proposal_discussion_plugin_simplified_abstract = ? AND tasks.target_id = ?) LIMIT 1", sa, target_id]
+      errors.add :base, _('This proposal has been previously registered') unless r.empty?
+    end
+
 end
--
libgit2 0.21.2