fixed issue #107

lib/twitter-ads/campaign/line_item.rb

@@ -85,5 +85,20 @@ def targeting_criteria(id = nil, opts = {})
  id ? TargetingCriteria.load(account, id, opts) : TargetingCriteria.all(account, @id, opts)
  end
 
+ def to_params
+ params = super
+
+ # If automatically_set_bid is set, bid_type must not be set.
+ params.delete(:bid_type) if params.key?(:automatically_select_bid)
+
+ # If set to true, bid_amount_local_micro must be NULL
+ params.store(:bid_amount_local_micro, nil) if params[:automatically_select_bid] && !self.id.nil?
+
+ # advertiser_user_id is currently beta-only and causes an error when sent.
+ params.delete(:advertiser_user_id)
+
+ params
+ end
+
  end
 end