Cost component split and semifinished product

Hi Gurus,

i have the problem with cost component split and roll up cost component for semifinished product. Our cost component split is:

10     raw material

20     semifinished product

30     external coopertion

.

.

and so on... the next is not relevant

So the lowest material number 1 has costs in raw material (10) of cost component split. The next level of BOM material 2 has raw material (10) too and the material number 1 from lower level of BOM, but in cost component split is 20 semifinished product blank. All material costs from lower level are in 10. I need to see in cost component split seminished product from lower level in 20.

I know about: the idea of having both itemization and cost component split. In itemization are costs of material without multi-level roll up and in cost component split are costs with cost roll up.

Do You have experience with this, some solution?

Thanks a lot, Gustav