Updating WITH_ITEM table through BAPI_ACC_DOCUMENT_POST

Hi all,

I have a query on posting a document. When a document is posted through F-43 t-code, it's creating antries in BSEG table as well as WITH_ITEM table too. Now, we need a report which calls BAPI_ACC_DOCUMENT_POST for posting a document through which BSEG will be updated. But when we do this, WITH_ITEM is not getting updated. Can anyone explain me why it's happening so and how to get this solved.

Thanks a lot.