I try to replace default value of VBAK-KKBER with another value during sales order creation in VA01. I could find structures like VBAK, XVBAK, YVBAK, SVBAK, etc in MV45AFZZ. I assigned new value for KKBER field in these structures and tested. I tested userexit_save_document, userexit_move_field_to_vbak and another userexit EXIT_SAPFV45K_001. But could not replace VBAK-KKBER value, after sales order creation VBAK table shows old default value.
Anyone can give me an idea to solve my issue.
All helpful answers will be awarded.