Upgrading InDesign and InCopy templates
When you are upgrading to a new version of Adobe InDesign or InCopy (for instance as part of upgrading Enterprise Server), also convert any InDesign and InCopy templates that you use to the new version of InDesign and InCopy.
Do this by opening the file and re-saving it.
Note: Once layouts have been saved to the newer version of InDesign, they cannot be opened in a previous version without converting them to .IDML format. Doing so will remove all links to any placed database files.