By default, each time you load a forecast the most current data from the cost ledger is used to update some of the currency fields in the Forecasts Details Tab Table. Use this button to lock those fields with the currently displayed values. You can then click the button again to unlock those fields and return the record to the default behavior.
The table below shows the fields that are locked/unlocked by this button.
Field
Calculated As
Total Budget
The sum of Original Project Budget and Project Budget Changes in the Cost Ledger.
Anticipated Budget - PV
Equals Total Budget
Anticipated Cost
The sum of Original Commitments and Commitment Changes and Non-Commitment Costs in the Cost Ledger.
Anticipated Variance
Anticipated Budget - PV minus Anticipated Cost.
Forecast Variance
Total Budget minus Forecast At Completion.
This is a toggle button. The two states are:
(the default) - The Forecasts Details Tab Table is currently unlocked. Loading the tab will load the latest cost data into the table. Click this button to lock the table.
- The Forecasts Details Tab Table is currently locked. The cost data displayed will still show the next time the tab is loaded. Click this button to unlock the table.
If you click this button PMWeb automatically sets the Forecast to Complete field on each line equal to(Actual Cost divided by % Complete) minus Actual Cost
(the default) - The 
