How is the Total Exposure calculated for Parent / Child Relationship on P42050

The credit check program (P42050) shows the total exposure correctly for each customer individually.

I have a parent/child relationship set up as follow:

A/B#1000 as parent

A/B#1501 as its child

A/B#1502 as its child as well.

A/B#1501's sales orders sums up $500.00

A/B#1502's sales orders sums up $750.00

A/B#1000's sales orders sums up $800.00

When I inquiry the parent (A/B#1000) through the P42050, I was expecting to see the total exposure of $2,050.00, but the application shows the total exposure individually, regardless my set up.

Am I wrong on my assumptions?

Thank you