How to project full year sales for a person using TOTAL YTD

[Mavericks334]

Hi,

I am able to project the total sales for the year using TOTAL YTD and Year FRAC combined.

However from the same data if i try to project the total sales for individual person it does not work? I have tried using filter as well and does not seem to work?

Below is the measure for the entire unit:

=TOTALYTD(SUM(MDS_YTD[USD Amount]),MDS_YTD[Related_Date],ALL(MDS_YTD))/YEARFRAC(CONCATENATE("26/12/",YEAR([Related_Date])-1),[Related_Date])

How do i modify the above measure to get it for an individual person.

Regards,
Ren.