BSYR204E Alias alias is not in the specified Usercat user_catalog. If you want to use this alias, you need to add it to the usercat first. Edit online Explanation The specified alias must exist in the specified MVS™ user catalog first. User response You can add the alias to the usercat by using the A command next to the usercat in the New MVS User Catalogs section of the System Setup Information screen. Parent topic: Messages