the cost of price of sub-bom is wrong

[mike]

test with openerp7.0:

I meet a new problem, when I defined product A、B、C、D。

The BOM of Struct is Like:

 A<--2B+C

C<--0.2D (that means one D can produce five C)

If the cost price of D is 10$, I hope to see the cost price of C is 2$,

 When I test the report for C's bom cost of struct , it is right, the report tell me the cost price of C is 2$ .

But ,when I test the report for A's bom cost of struct, the report tell me the cost of C is 0$, and the cost of A is also wrong.

I find this bug only happens when I try to define a sub-material that it's quantity is float. ( C<--0.2D) , That is, if i define like C<--2D， all things looks fine.