BOM Calculation AX 2012 - Explosion Type Multilevel

Hi,

I have BOM Item A (standard inventory quantity set to '10' units) consuming purchase item B.

Route on Item A says, that it requires 1 hour of set up time (to produce 10 units of item A, set as standard inventory quantity).

Now when I run the BOM calculation for 25 Pcs of  Item - A, with explosion type set to multilevel, I expected 3 Hours of

setup from calculation but actual is one hour only.

Can any one suggest me if i missed something ?

Same was working in AX 2009 but I believe I missed the setting AX 2012. 

Thanks in Advanced.