Some DataSource or DataView support change notification: when the underlying data is changed BimSens is notified and can automatically refresh the data displayed to reflect the latest changes.
When BimSens receives a notification of change it will display the message: "Changes detected on the data source" to let you know that you are not seeing the latest data. You can ignore this message and keep working but some DataSource will prevent you from making edits to the data to avoid data override or loss, until you refresh the data.
Alternatively you can activate the Automatic Refresh function so that BimSens refreshes the data as soon as it receives the notification.
To enable this option go to Option > Refresh and check the box Refresh when the View notifies of changes.