Custom Measure SAP BPC 10.0

Hi experts,

I'm trying to create a custom measure to display cumulated values over all years. Which means if I have a time dimension that contains for example these years : 2013, 2014, 2015, 2016 with all levels (Months, Quarters, Years)

I need to calculate the cumulative values from 2013.01 until Now, not YTD or QTD

How can I achieve that ?

I'm using SAP BPC 10.0 NW SP05

Thanks

Maha