Table COEP - OBJNR

Dear Gurus,

I want to ask about Object Number - OBJNR in table COEP.

As we know OBJNR is 22 digit char.

CMIIW, this object is represent: Controlling Area (digit 3-6), Cost Center (digit 7-16 )

and Activity Type (digit 17-22).

How about digit 1-2? Is this represent what?

Sorry for this question because I'm very not familiar in FI-CO.

I'm trying to create extraction to SAP BW and considering to use datasource

Thanks.

Regards,

Steph