reload stuff gotten from map, because issues might have been moved around in the tree

app/models/project.rb

@@ -947,12 +947,12 @@ class Project < ActiveRecord::Base
       end
       # Parent issue
       if issue.parent_id
-        if copied_parent = work_packages_map[issue.parent_id]
+        if copied_parent = work_packages_map[issue.parent_id].reload
           new_issue.parent_id = copied_parent.id
         end
       end
-
       self.work_packages << new_issue
+
       if new_issue.new_record?
         logger.info "Project#copy_work_packages: work unit ##{issue.id} could not be copied: #{new_issue.errors.full_messages}" if logger && logger.info
       else
@@ -971,21 +971,23 @@ class Project < ActiveRecord::Base
       # Relations
       issue.relations_from.each do |source_relation|
         new_relation = Relation.new
-        new_relation.force_attributes = source_relation.attributes.dup.except("id", "work_package_from_id", "work_package_to_id")
+        new_relation.force_attributes = source_relation.attributes.dup.except("id", "from_id", "to_id")
         new_relation.to = work_packages_map[source_relation.to_id]
         if new_relation.to.nil? && Setting.cross_project_work_package_relations?
           new_relation.to = source_relation.to
         end
+        new_relation.to.reload
         new_issue.relations_from << new_relation
       end
 
       issue.relations_to.each do |source_relation|
         new_relation = Relation.new
-        new_relation.force_attributes = source_relation.attributes.dup.except("id", "work_package_from_id", "work_package_to_id")
+        new_relation.force_attributes = source_relation.attributes.dup.except("id", "from_id", "to_id")
         new_relation.from = work_packages_map[source_relation.from_id]
         if new_relation.from.nil? && Setting.cross_project_work_package_relations?
           new_relation.from = source_relation.from
         end
+        new_relation.from.reload
         new_issue.relations_to << new_relation
       end
     end