Alternate table apart from BSEG to retrieve IO,A/C Type etc.

Question: I am retreiving some fields like Company code,Internal Order,G/L A/c and A/c type from the table BSEG. I am using only one index of BSEG ie BUKRS. So this is creating a performance issue.

So can please anyone give the alternate tables through which we can retreive Company code,Internal Order,G/L A/c, A/L type.Such that i can avoid hitting a huge table BSEG.

Thanks in advance.

Answer:
For any GL posting, take a look at BSIS/BSAS tables .. for AR - BSID/BSAD and for AP - BSIK/BSAK .. check the following tables relationship diagrams:

http://www.sapgenie.com/abap/tables_fi.htm
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