Redmine

        # Re-insert removed custom fields with nil value

        # TODO check if custom_field_values has to be fixed to take that in account

        cf_values = custom_field_values.dup # Dupped because cached in an instance variable

        custom_fields = {}

        @custom_values_before_change.each{|i, v|

          cfv = cf_values.detect {|c| c.custom_field_id == i}

          next if cfv # On a not deleted custom field, or already re-added

          cf = custom_fields[i]

          if cf.nil?

            cf = CustomField.find_by_id(i)

          end

          # Custom field has not been deleted in between

          if cf

            cfv = CustomFieldValue.new

            cfv.custom_field = cf

            cfv.value = nil

            cf_values << cfv

          end

        }

        cf_values.each {|c|