set for rolling 12 months?

[Anonymous]

=Sum({<date ={">$(Date(=AddMonths(max(date),-12)))<=$(Date(=AddMonths(max(date),-1)))"} >}[budget amount])

here date is dimension

date:

1/1/2013

1/1/2014

2/1/2014

1/1/2015

1/2/2015

but it showing from   1/1/2013      why like this

pls correct me ?

[#2]

Hello,

Didn't try out but seems the equal sign is missplaced.

=Sum({<date ={">$(=Date(AddMonths(max(date),-12)))<=$(=Date(AddMonths(max(date),-1)))"} >}[budget amount])