RLS not working on Measures

Hi, 

I am creating a dashboard that will be used to view departmental Budgets/Forecasts and Actuals. I need to be able to implement RLS so that when each department head opens the report the data will be filtered to their specific budget/forecast/actual spend.

I have 3 fact tables: budget/forecast/overheads

I have several dimension tables: Company, Date, GL Details, Business Area (contains employee name, department, budget refs), Budget Owner (contains employee name and email address)

I have managed to create the RLS so that it filters the page to each department head e.g. Department = "IT". This enables them to see their individual budget/forecast, but when it comes to the measures I have created, YTD Actuals, Budget Variance and Forecast Variance, its not taking into consideration the RLS and is just showing the calculation for all departments.

Is there something that I need to add into the measures to make sure it filters based on the RLS?

Thanks,

Helen