BAPI_ACC_DOCUMENT_POST taxable amount

hi guys,

I am uploading data using BAPI_ACC_DOCUMENT_POST.

Transaction code for manual entry: FB01

I need to upload upload Tax code and taxable amount.

I found TAX code in ACCOUNTTAX (type BAPIACTX09) table of BAPI.

I could not find "Taxable amount." in the BAPI.

When I tried manually trhu FB01, i found "taxable amount" field.

So it must exist in the BAPI.

Please help me how to upload "taxable amount" using the above BAPI.