REFERENCE(CALLBACK) TYPE BAL_S_CLBK
REFERENCE(CALLBACK_IMP) LIKE BAL_S_CLBK OPTIONAL
REFERENCE(I_CALLBACK) LIKE BAL_S_CLBK OPTIONAL
VALUE(I_CLBK) TYPE BAL_S_CLBK-USEREXITF
REFERENCE(I_CLBK) TYPE BAL_S_CLBK OPTIONAL
VALUE(IS_CALLBACK) TYPE BAL_S_CLBK
VALUE(IS_CALLBACK) TYPE BAL_S_CLBK OPTIONAL