Please Help for sum by specific dimension / AGGR function

[#1]

Hello i try in a simple table with 2 dimensions (Tiers comptable (Customer) ans Numpiece (NumOrder) and the expression below :

=If(Today()-[D_ENTET.Date d'échéance de la pièce]>=0,sum({$<[D_ENTET.Module d'origine] = {"2 - Comptabilité"},[D_COMPTECPTA.Compte cumul 2] = {41},NumPiece =>} [F_COMPTABLE2.Solde (D-C) en devise société]),0)

In a simple tab, i can display the total automaticaly with option graphic object.

i would like to make a sum of my expression by only dimension Tiers comptable (Customer) but it doesn't work !!!

I try with AGGR function but the result it's not OK. I want to display the sum of lines whith are ok in my test if today...

I would like to obtain the result 352274,4 for the customer 0002076145 but with a sum or aggr function in my expression.

Please see the attachement for concrete example.