Hi,

I'm working on Odoo v10 and I'm having issues to understand what's happening on how Odoo calculate time on tasks and sub-tasks. 

I've created a test project. 

Inside of that project, 

I've created two tasks: task A and task B.

Inside task A, I've created two sub-tasks: sub-task 1 with 10h initial hours and sub-task 2 with 5 initial hours. 

When I go to Search > Tasks and create a pivot table and select: initial hours, spent hours and remaining hours, I get this:

Task A | 0 initial hours | 0 spent hours | 0 remaining hours

Sub-task 1 | 10 initial hours | 3 spent hours | 7 remaining hours

Sub-task 2 | 5 initial hours | 4 spent hours | 1 remaining hours

Although the math on the Sub-tasks are correct, those values don't revert back to the ascending task, Task A. Therefore, I can't get a correct reading on the task status. 

What I would like to see is a sum of all from the sub-tasks added to the values inserted on the Task itself. This way I can monitor the progress of the task and of the underlying tasks. 

Is this a bug or I'm doing something wrong?

Thanks in advance.