diff --git a/lib/redmine_contracts/budget_plugin_migration.rb b/lib/redmine_contracts/budget_plugin_migration.rb
index 795af24..79ed845 100644
--- a/lib/redmine_contracts/budget_plugin_migration.rb
+++ b/lib/redmine_contracts/budget_plugin_migration.rb
@@ -74,18 +74,7 @@ module RedmineContracts
 
           end
 
-          if old_deliverable['materials'].present? && old_deliverable['materials'] > 0.0
-            deliverable.overhead_budgets << OverheadBudget.new(:deliverable => deliverable,
-                                                               :budget => old_deliverable['materials'],
-                                                               :hours => 0)
-          elsif old_deliverable['materials_percent'].present? && old_deliverable['materials_percent'] > 0.0
-            materials = @total * (old_deliverable['materials_percent'].to_f / 100)
-            deliverable.overhead_budgets << OverheadBudget.new(:deliverable => deliverable,
-                                                               :budget => materials,
-                                                               :hours => 0)
-
-          end
-
+          convert_materials(deliverable, old_deliverable, @total)
           append_old_deliverable_to_notes(old_deliverable, deliverable)
           
           deliverable.save!
@@ -113,6 +102,21 @@ module RedmineContracts
       contract
     end
 
+    def self.convert_materials(deliverable, old_deliverable, total)
+      if old_deliverable['materials'].present? && old_deliverable['materials'] > 0.0
+        deliverable.overhead_budgets << OverheadBudget.new(:deliverable => deliverable,
+                                                           :budget => old_deliverable['materials'],
+                                                           :hours => 0)
+
+      elsif old_deliverable['materials_percent'].present? && old_deliverable['materials_percent'] > 0.0
+        materials = total * (old_deliverable['materials_percent'].to_f / 100)
+        deliverable.overhead_budgets << OverheadBudget.new(:deliverable => deliverable,
+                                                           :budget => materials,
+                                                           :hours => 0)
+
+      end
+    end
+
     def self.append_old_deliverable_to_notes(old_deliverable, new_deliverable)
       new_deliverable.notes += "Converted data:\n<pre>" + old_deliverable.pretty_inspect + "</pre>"
     end