As part of our ongoing efforts to improve DFP's performance and stability, we will be introducing limits on select DFP items, beginning June 30, 2014. As an API user, here’s how this change will affect you.

If you create more children than the allowed maximum for an entity, or modify an existing entity so that its number of children exceeds those limits, the API will throw an EntityChildrenLimitReachedError. Refer to the error’s reason field for an explanation for each type of entity that exceeds a child limit. The best way to handle this situation is to catch ApiException errors in your code, check the error type, and perform whatever is appropriate for your application based on the reason.

For a more detailed example of best practices with ApiException errors, please see this blog post on troubleshooting and error handling.

As always, if you have any suggestions or questions, feel free to drop us a line on our API forums or Ads Developer Google+ page.