Calculation Basis Scenario Dimension The calculation basis on which values are reported. Valuation LYTY Reported value is the current position, based on previous year's valuation basis, except substituting current year's investment and economic assumptions Valuation TY Reported value is 'This Year' - current position, based on current year's valuation basis Estimate The reported value is an estimate. Valuation LY Reported value is 'Last Year' - current position, based on previous year's valuation basis Valuation The reported value is a valuation. Actual The reported value is actual. Forecast The reported value is a forecast.