Dimension member formula BPC 10 NW

Dear Experts,

Firstly I don't find too much literature on Dimension Member formula for NW version .I guess SAP probably don't think its good for performance .

It would be good if could point me to some good ones.

I have a query where I want create a formula like this...:

Account A1

Account A1_LYDEC

How I get this LYDEC in NW version (Last Year December )??

I thought of using LYLP property with CURRENT MEMBER

( [ACCOUNT].A1,[TIME].CURRENTMEMBER.PROPERTIES("LYLP")).

Can anyone suggest a good way to do it??

Regards,

Rakesh Kumar