Missing field of company code from default value in MM01

Hi Experts,

Our system recently got upgraded from 4.7 to ECC6.0. And we face a problem in the new 6.0 system.

When we run tcode MM01, and try to default some value, eg. Organizational unit, we try to set default company code, but we can not find it any more. In the screen painter SE51, we can see company code as one of organization units that can be set as default in MM01, but why we can not see it in MM01?

Can someone advise? Thank you very much.

Regards,

Helen