As already indicated any changes to the Cashflow while in Edit Mode are held in a temporary table until saved. Save Cashflow saves your current workings to the CashflowForecasts table.

The Undo Options are:

Rebuild from the Last Saved Cashflow for the Period.
This overwrites the figures in the temporary table with the saved figures from the CashflowForecasts table for the same period

Rebuild from Previous Cashflow Period.
This overwrites the figures in the temporary table with the saved figures from the CashflowForecasts table for the preceding period. This changes the aging of the spread as with the initial Create Cashflow explained above.

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