Use the exit SDVFX008 include (ZXVVFU08) and update the structure XACCIT
or
You can use the BTE 00001120 DOCUMENT POSTING: Field substitution header/items
for substitueting the BSEG Values.
All you have to do is replace/substiturte values in the structure T_BSEGSUB.
Example :
LOOP At T_BSEG_SUB into WA_BSEG_SUB..
WA_BSEG_SUB- .... = ' '.
MODIFY T_BSEGSUB FROM WA_BSEG_SUB INDEX LV_IDX.
ENDLOOP.
Thanks,
VJ.