Update Baseline date using 'RV_ACCOUNTING_DOCUMENT_CREATE'

Hello!

I am to update the baseline date BSEG-ZFBDT through the use of 'RV_ACCOUNTING_DOCUMENT_CREATE'. I modified it in a user exit 'EXIT_SAPLV60B_001'. What i did is to update XACCIT-ZFBDT which is exported from the user-exit. But when I am to check BSEG-ZFBDT, this is not updated. Can anyone help me on this?

Thanks in advance!