field in BAPI for posting key..

hi,

I went thru the forum and found some info in one of the posts but still has my doubt.

I am trying to post GL line items using BAPI_ACC_DOCUMENT_POST. Where and how do we pass the posting key or debit credit indicator ? I dont find any relevant field in the BAPI for this. In one of the posts I read that i can do it in SHKZG but I dont find in any of the structures in the BAPI. Am I missing something ?

thks