You can rename only the custom objects in the Best Practice Customization Mode. Follow the steps given below to rename an object:
If the object is open for modification, close the editor.
In an object list or the Search Results tab, right-click the object and select Rename.
In the Rename dialog box, type the new name and click OK. Object names must be unique for each AR System server. Names can be as many as 80 characters, including spaces. Application and packing lists have a single set of names, so you cannot create an application and a packing list with the same name. When you rename an object, all references in any related object (for example, an active link attached to a form) are automatically updated.