Material Master : company code - BMMH1 structure ?

Hi,

it's possible that this question will be a bit stupid, in this case, I apologize. When I create material master using MM01, SAp never ask me for company code.

It ask me for : material type, plant, storage location, sales organization, distribution chanel and so on depending on the view I'm creating.

So, BUKRS doesn't exist in MARA, MARC,MARD, MLAN ...

So, why is there a "Company Code " in the BMMH1 structure used in material master lsmw ?

Where in material master is the company code used and if used, why SAP never ask me for ?

As I said, it may seem stupid ...

thanks for help,

Regards