BSO aggregation data mismatch between EPM versions

hi,

We are trying to migrate BSO cube from v11.1.1.3 to v11.1.2.3.500 and we have data mismatch on parent level after aggregation.

We have below hierarchy which has issues, all t

he below members are stored.

on v11.1.1.3 after aggregation Parent

A&B are able to retrive data.

ParentA(+) -100

   Child1(~)    -100

ParentB(+) -200

   Child1(~) - #MISSING

   Child2(~) - 200

but the same not happening in v11.1.2.3.500 and it requires below modification.

ParentA(+)

   Child(+)

ParentB(+)

   Child(+)

   Child(+)

Please advise what is missing here and is there any functionality changes on how implied share working in v11.1.2.3.500?

Regards

Vazir