If dbcc upgrade_object finds a reserved word used as an object name in a compiled object, it returns an error, and the upgrade of that object fails. To fix the error, either manually change the object name or use quotes around the object name and issue the command set quoted identifiers on. Then, drop and re-create the compiled object.
For example, suppose you load a database dump from Adaptive Server 11.5 into Adaptive Server 12.5 and the dump contains a stored procedure that uses the word “lock.” When you run dbcc upgrade_object on that stored procedure, the command returns an error because, although “lock” was not reserved in version 11.5, it became a reserved word in version 11.9.2. With this advance notice, you can change the stored procedure and any related tables before they are used in a production environment.