For BAPI_ACC_DOCUMENT_POST and BKPF-TCODE

HI,ALL

    When I use BAPI BAPI_ACC_DOCUMENT_POST in my program then posting OK and getting a accounting document. Then I check table BKPF and find the field TCODE that record is 'ZFI1029'. I don't know why it isn't a standard TCODE ?

    Whether your SAP system is also in the same situation ?  pls give directions ,thanks a lot .