diff --git a/app/models/report.rb b/app/models/report.rb
index fa9a88375d..fd6112dc94 100644
--- a/app/models/report.rb
+++ b/app/models/report.rb
@@ -1,7 +1,8 @@
 require 'forwardable'
 
 class Report < ActiveRecord::Base
-  InheritedNamespace.activate
+  InheritedNamespace.activate unless defined? Rails && Rails.version =~ /^3./
+
   extend Forwardable
   include Enumerable
   #belongs_to :user
diff --git a/app/models/report/chainable.rb b/app/models/report/chainable.rb
index 3b0f469779..6f5ba107ec 100644
--- a/app/models/report/chainable.rb
+++ b/app/models/report/chainable.rb
@@ -1,5 +1,5 @@
-# Proviedes convinience layer and logic shared between GroupBy::Base and Filter::Base.
-# Implements a dubble linked list (FIXME: is that the correct term?).
+# Provides convinience layer and logic shared between GroupBy::Base and Filter::Base.
+# Implements a double linked list (FIXME: is that the correct term?).
 class Report < ActiveRecord::Base
   class Chainable
     include Enumerable
@@ -63,6 +63,12 @@ class Report < ActiveRecord::Base
       name.demodulize.underscore
     end
 
+    def self.put_sql_table_names(table_prefix_placement = {})
+      @table_prefix_placement ||= {}
+      @table_prefix_placement.merge! table_prefix_placement
+      @table_prefix_placement
+    end
+
     ##
     # The given block is called when a new chain is created for a report.
     # The query will be given to the block as a parameter.
@@ -72,7 +78,7 @@ class Report < ActiveRecord::Base
       engine.chain_initializer.push block
     end
 
-    inherited_attribute :label
+    inherited_attribute :label, :default => :translation_needed
     inherited_attribute :properties, :list => true
 
     class << self
@@ -101,7 +107,7 @@ class Report < ActiveRecord::Base
     end
 
     def to_a
-      returning([to_hash]) { |a| a.unshift(*child.to_a) unless bottom? }
+      [to_hash].tap { |a| a.unshift(*child.to_a) unless bottom? }
     end
 
     def top
@@ -285,7 +291,10 @@ class Report < ActiveRecord::Base
     end
 
     def with_table(fields)
-      fields.map { |f| field_name_for f, self }
+      fields.map do |f|
+        place_field_name = self.class.put_sql_table_names[f] || self.class.put_sql_table_names[f].nil?
+        place_field_name ? (field_name_for f, self) : f
+      end
     end
 
     def field
@@ -293,4 +302,4 @@ class Report < ActiveRecord::Base
     end
 
   end
-end
\ No newline at end of file
+end
diff --git a/app/models/report/group_by/base.rb b/app/models/report/group_by/base.rb
index 0d90117bd8..b8c99b1aeb 100644
--- a/app/models/report/group_by/base.rb
+++ b/app/models/report/group_by/base.rb
@@ -32,8 +32,35 @@ class Report::GroupBy
       end.uniq
     end
 
+    def self.select_fields(*fields)
+      unless fields.empty?
+        @select_fields ||= []
+        @select_fields += fields
+      end
+      @select_fields
+    end
+
+    def select_fields
+      if self.class.select_fields
+        (parent ? parent.select_fields : []) + self.class.select_fields
+      else
+        group_fields
+      end
+    end
+
+    ##
+    # @param [FalseClass, TrueClass] prefix Whether or not add a table prefix the field names
+    # @return [Array<String,Symbol>] List of select fields corresponding to self and all parents'
+    def all_select_fields(prefix = true)
+      @all_select_fields ||= []
+      @all_select_fields[prefix ? 0 : 1] ||= begin
+        fields = select_fields.reject { |c| c.blank? or c == 'base' }
+        (parent ? parent.all_select_fields(prefix) : []) + (prefix ? with_table(fields) : fields)
+      end.uniq
+    end
+
     def clear
-      @all_group_fields = nil
+      @all_group_fields = @all_select_fields = nil
       super
     end
 
@@ -58,9 +85,8 @@ class Report::GroupBy
     end
 
     def define_group(sql)
-      fields = all_group_fields
-      sql.group_by fields
-      sql.select fields
+      sql.select all_select_fields
+      sql.group_by all_group_fields
     end
   end
 end
\ No newline at end of file
diff --git a/app/models/report/group_by/singleton_value.rb b/app/models/report/group_by/singleton_value.rb
index 197b9fcf80..68deb502a4 100644
--- a/app/models/report/group_by/singleton_value.rb
+++ b/app/models/report/group_by/singleton_value.rb
@@ -2,6 +2,9 @@ class Report::GroupBy
   class SingletonValue < Base
     dont_display!
 
+    put_sql_table_names "singleton_value" => false
+    select_fields "1 as singleton_value"
+
     def define_group(sql)
       sql.select "1 as singleton_value"
       sql.group_by "singleton_value"
diff --git a/app/models/report/sql_statement.rb b/app/models/report/sql_statement.rb
index 3aded2e7ef..c2f415b64a 100644
--- a/app/models/report/sql_statement.rb
+++ b/app/models/report/sql_statement.rb
@@ -171,7 +171,7 @@ class Report::SqlStatement
   #   @return [Array<String>] All fields/statements for select part
   def select(*fields)
     return(@select || default_select) if fields.empty?
-    returning(@select ||= []) do
+    (@select ||= []).tap do
       @sql = nil
       fields.each do |f|
         case f
@@ -200,7 +200,7 @@ class Report::SqlStatement
   #   @param [Array, String, Symbol] fields Fields to add
   def group_by(*fields)
     @sql = nil unless fields.empty?
-    returning(@group_by ||= []) do
+    (@group_by ||= []).tap do
       fields.each do |e|
         if e.is_a? Array and (e.size != 2 or !e.first.respond_to? :table_name)
           group_by(*e)
diff --git a/app/models/report/validation.rb b/app/models/report/validation.rb
index a4d0b7dc96..bc8e1cd3d8 100644
--- a/app/models/report/validation.rb
+++ b/app/models/report/validation.rb
@@ -4,7 +4,7 @@ module Report::Validation
       register_validation(val_method)
     end
   end
-  
+
   def register_validation(val_method)
     const_name = val_method.to_s.camelize
     begin
@@ -23,13 +23,11 @@ module Report::Validation
   end
 
   def errors
-    @errors ||= []
-    @errors
+    @errors ||= Hash.new { |h,k| h[k] = [] }
   end
 
   def validations
     @validations ||= []
-    @validations
   end
 
   def validate(*values)
diff --git a/app/models/report/validation/dates.rb b/app/models/report/validation/dates.rb
index 79e3ae9fde..8f07138603 100644
--- a/app/models/report/validation/dates.rb
+++ b/app/models/report/validation/dates.rb
@@ -7,7 +7,7 @@ module Report::Validation
         begin
           !!val.to_dateish
         rescue ArgumentError
-          errors << "\'#{val}\' " + l(:validation_failure_date)
+          errors[:date] << val
           validate_dates(values - [val])
           false
         end
diff --git a/app/models/report/validation/integers.rb b/app/models/report/validation/integers.rb
index 23a1b96356..c710965cb1 100644
--- a/app/models/report/validation/integers.rb
+++ b/app/models/report/validation/integers.rb
@@ -5,7 +5,7 @@ module Report::Validation
       return true if values.empty?
       values.flatten.all? do |val|
         if val.to_i.to_s != val.to_s
-          errors << "\'#{val}\'" + l(:validation_failure_integer)
+          errors[:int] << val
           validate_integers(values - [val])
           false
         else
diff --git a/tasks/spec.rake b/lib/tasks/spec.rake
similarity index 88%
rename from tasks/spec.rake
rename to lib/tasks/spec.rake
index cac94a68ba..aa6dad5f96 100644
--- a/tasks/spec.rake
+++ b/lib/tasks/spec.rake
@@ -4,13 +4,13 @@ begin
     namespace :plugins do
       desc "Runs the examples for reporting_engine"
       Spec::Rake::SpecTask.new(:reporting_engine) do |t|
-        t.spec_opts = ['--options', "\"#{RAILS_ROOT}/spec/spec.opts\""]
+        t.spec_opts = ['--options', "\"#{Rails.root}/spec/spec.opts\""]
         t.spec_files = FileList['vendor/plugins/reporting_engine/spec/**/*_spec.rb']
       end
 
       desc "Runs the examples for reporting_engine"
       Spec::Rake::SpecTask.new(:"reporting_engine:rcov") do |t|
-        t.spec_opts = ['--options', "\"#{RAILS_ROOT}/spec/spec.opts\""]
+        t.spec_opts = ['--options', "\"#{Rails.root}/spec/spec.opts\""]
         t.spec_files = FileList['vendor/plugins/reporting_engine/spec/**/*_spec.rb']
         t.rcov = true
         t.rcov_opts = ['-x', "\.rb,spec", '-i', "reporting_engine/app/,redmine_reporting/lib/"]