Sales for Max Elapse

[#1]

Hi,

Can you help me please to find the error in this expression :

=Max({1} Aggr(sum({$<[Due Year] ={">=$(=(max([Due Year])-($(V_YearBack)))) <=$(=(max([Due Year]) ))"},
Elapse={"<=$(=(Elapse))"}>}
Sales_$(V_Currency)), Elapse,

[Due Year],

[Due Month]))/1000

this expression returns the result below :

Due Year	Due Month	Elapse	Backlog
			58,558
2011	04	-36	29,721
2012	04	-50	11,706
2012	04	-43	22,119
2012	04	-36	33,758
2012	04	-29	46,705
2012	04	-22	47,495
2012	04	-15	49,322
2012	04	-8	49,926
2013	04	-50	9,983
2013	04	-43	21,439
2013	04	-36	33,712
2013	04	-29	45,932
2013	04	-22	54,289
2013	04	-15	57,664
2013	04	-8	58,558

What i want to see is sales for the Max Elapse ?

Thanks for your help