Change history and undo

Inspect project data operations and undo related changes together.

Last updated: 10 November 2026

What appears in history?

History lists saved operations with the user, time, description and affected record counts. A single operation may change several features, devices, connections or relationships. Those changes are kept and undone together.

For example, records created by a file import appear under one import operation. A route change or connection edit may also cover several records.

Selecting a history row selects or fits the relevant map features into view if they still exist. Placement changes may show previous and new Location, Splice tray and Slot values. Expand the details with Show all where available.

Undo an operation

1. Open History on the left.
2. Identify the correct operation by its description, time and affected records.
3. Select Undo this operation on its row.
4. Read the scope in Undo operation.
5. Confirm with Undo and check the result.

Undo requires write permission. An operation affecting a disabled module's record cannot be undone, even if you can read that record.

Why might undo be rejected?

The same record may have changed later or gained new dependent records. In that case, the application asks you to undo later operations first. Review related changes starting with the newest.

Undo also passes through current model consistency and policy checks. Read any warning or rejection reason; do not assume only part of the operation completed.

Undo an undo

Undo itself is recorded in history. Redo (apply the operation again) on that new row reapplies the earlier operation where conditions permit. Intervening changes may also block this action.

Toolbar undo

Undo in the Edit toolbar provides quick access to the current session's recent saved operations. This short list resets when you change projects. Use History for older records.

History does not replace a project package or database backup. Permanent administrative actions such as Delete project cannot be reversed here. Obtain a project package to retain a project for transfer.