Changing usernames can have several significant impacts:

• Pending Approval Transactions: Users will lose all pending approval transactions from their worklist and will be unable to approve them.
• Approval History: The history of approval transactions will be lost.
• Delegation and Vacation Rules: These rules will also be lost.
• Scheduled Processes: All scheduled processes submitted under the old username will remain associated with the old username. These may fail, so it’s advisable to cancel the old schedules and reschedule them with the new user IDs.
• Favorites: All items saved in favorites will be lost.
• WHO columns: For existing transactions, the “created by” and “last updated by” fields will retain the old username. For new transactions, these fields will reflect the updated username.

Note: The recommended approach is to deactivate the old username and create a new one.