PM order and sub order

Dear Mentor/s,

I have created one main/superior order in PM and further split it into two sub order. I have received the external service for sub order. The main order value is 150000 and two sub order value is 100000 and 50000. Further i have settled two sub order first and then superior order. When moving to "Cost overview of order hierarchies" , its showing value 300000 and i m fully confused. So, (1) is it right to settle sub order first and then superior order (2) only settle sub order not the superior order.

I have attached screenshot for your necessary review.

Thank in advance for your cooperation.

Regards

Nader