Budget vs Actual in P&L

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Hi, I'm trying to design a P&L report in Sage Report Designer and can't figure out how to write an expression for the variance "Budget - Actual". I've tried numerous scenarios of SumNLNominalAccountThisYearsBudgetThisMonth0 - SumNLNominalAccountThisYearsThisMonth0 but can't get the numbers to work.

Can anyone help?

Thanks