BAPI_ACC_DOCUMENT_POST - without converting the amount in local currency

Hi

I am trying to do the posting through BAPI_ACC_DOCUMENT_POST and it works fine. But the issue is the amount I am passing as local currency from excel was not accepted and the document currency was actually converted and filled in local currency. What to do to make the BAPI to accept the value for the local currency without being converted automatically.

Thanks in advance.