Query: Activities that are sources for a given a-flow-linePurpose: Returns the activities that are sources of a-flow-lines in the input liststm_r_ac_source_of_af (stm_list in_list,
int *status);
Query: Activities that are targets of a given a-flow-linePurpose: Returns the activities that are targets for a-flow-lines in the input liststm_r_ac_target_of_af (stm_list in_list,
int *status);