For getting a GUID_RAW_16 I'm using the below FM
DATA: lv_my_guid_raw_16 TYPE guid_16. "Its RAW type w/ 16
CALL FUNCTION 'GUID_CREATE'
ev_guid_16 = lv_my_guid_raw_16.
But, my lead is not OK for using this FM bcz its obsolete and we are getting the same ERROR in SLIN QA check, pls. let me know any good FM/CLASS for generating a RAW 16 GUID