How to update accounting document header text and line Item text

Hi,

I need to update the accountting document header text( BKPF-BKTXT ) and line items text (BSEG-SGTXT) .

This can not be done using the BDC(FB02), because in between we may get diffrent popup screens. so I am looking for BAPIs or FMs to do the same.

Please let me know if there are any BAPI's or Function modules to update the accounting document header text and line items text.

Thanks in advance