We would like to remind you that as previously announced, destination URL fields in AdWords will become read-only on July 1, 2015. Starting on that date, we will also begin upgrading your URLs (if eligible) to the new Upgraded URLs structure.

Once this change goes live, you will get the following errors from the AdWords API:

• EntityAccessDenied.WRITE_ACCESS_DENIED error if you try to modify:
  • destinationURL field of BiddableAdGroupCriterion
  • appUrl field of AppFeedItem
  • sitelinkUrl field of SitelinkFeedItem
  • attributeValues field of FeedItem that corresponds to a column with mapping for a sitelink URL, app URL or a dynamic remarketing destination URL
• AdError.CANNOT_SET_FIELD error if you try to modify the url field of various ad types

In AdWords scripts, all methods that set the destination URL of various entities have been marked deprecated, and will generate a user error after July 1, 2015.

Before then, be sure to update your AdWords API and scripts code. Use the Upgraded URL fields instead of the destination URL field when creating entities such as ads, keywords, or sitelinks. You can refer to our migration guide to learn how to upgrade your URLs, or our feature guide to learn more about Upgraded URLs. All our client libraries fully support upgraded URLs, and provide code examples that show you how to use this feature and upgrade your URLs.

If you have any further questions about this change, let us know via our API or scripts forum, or Google+ page.

Anash P. Oommen, AdWords API Team

Source: Google Ads Developer Blog