BPC 10 NW Member Formula

Hello Experts,

I am on SAP BPC 10 NW environment and I have a requirement to create Account Member Formula to get the last 12 period values for SALES_TOT Account

My Member Formula is as Below and it works fine

[SALES_TOT]+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(1))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(2))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(3))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(4))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(5))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(6))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(7))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(8))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(9))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(10))+([ACCOUNT].[SALES_TOT],[TIME].CURRENTMEMBER.LAG(11))

But some one suggested me that I can also use SUM MDX formula for above requirement.I wrote the below formula but it doesnt pulls any record.

I would like to use SUM formula as I have many such member formula requirement based on time lag and my formula becomes huge if I don't use it

SUM({[TIME].CURRENTMEMBER.LAG(0):[TIME].CURRENTMEMBER.LAG(11)},[ACCOUNT].[SALES_TOT])

Can anyone help me identify the issue in SUM Formula?

Thanks for your help

Regards,

Senoy