Multilayered "group by" with aggregated field

[gmaison]

Hi,

i’m still struggling with sompething that seems simple but i’m unable to do. (Creating a sorted group by using 3 linked tables)

I have 3 tables :
T3 is referencing T2 which is referencing T1

i’d like to get a list of grouped T1 records with the sum aggregation of a field in T3.

T1 (0,n) <->(1,1)T2 (1,n) <->(1,1) T3

any help much appreciated !

Thanks a lot !

Best regards,