Method: CONSTRUCTOR
Method: IF_PT_BSF_BUSUB_FACTORY~CREATE_BUSUB
Method: ON_NO_BUMOD_FOUND
Method: ON_STEP_OUT_OF_SEQUENCE
Method: IF_PT_BSF_RULE_STEP_STRATEGY~GET_RULE_STEP
Method: GET_CURRENT_RULE
Method: GET_NO_OF_RULE_STEPS