You must verify that the object store names, custom classes, or custom properties in your current version do not conflict with reserved words before you begin the upgrade from version 3.5.2.
Verify that your custom classes and properties do not conflict with the reserved words listed in "New Content Engine classes and properties" in Plan and Prepare Your Environment for IBM® FileNet® P8 that describes how you must change any custom class or custom property names in your existing object stores. If you have previously defined any classes or properties in a version 3.5.2 object store with symbolic names that are the same as any of the reserved class or property symbolic names, the upgrade tool detects the naming conflicts and requires you to change your class or property names before it upgrades the object store. Therefore, you must resolve conflicts between your version 3.5.2 symbolic names and the version 4.0 and 4.5 symbolic names.