Re: partitioned table

when I manually mocking the data into both tables are fine and when I run the procedure, I get errorcode: 42P10 MSG: there is no unique or exclusion constraint matching on the CONFLICT specification

the procedure is 

INSERT INTO ecisdrdm.bnft_curr_fact AS prod (bnft_fact_id, bene_cntry_of_brth_id, bene_cntry_of_rsdc_id, 

bene_cntry_of_ctznshp_id, frm_id, svc_ctr_id, actn_dt_in_id, actn_tm_in_id, src_sys_id, 

bnft_hist_actn_id, bene_id, bene_end_dt_id, petnr_app_id, atty_id, uscis_emp_id, application_id, 

rmtr_id, prpr_id, mig_filename)

SELECT stg.bnft_fact_id, stg.bene_cntry_of_brth_id, stg.bene_cntry_of_rsdc_id, 

stg.bene_cntry_of_ctznshp_id, stg.frm_id, stg.svc_ctr_id, stg.actn_dt_in_id, stg.actn_tm_in_id, stg.src_sys_id, 

stg.bnft_hist_actn_id, stg.bene_id, stg.bene_end_dt_id, stg.petnr_app_id, stg.atty_id, stg.uscis_emp_id, stg.application_id, 

stg.rmtr_id, stg.prpr_id, stg.mig_filename

FROM ecisdrdm.stg_bnft_curr_fact stg

ON CONFLICT ("bnft_fact_id") DO UPDATE 

SET (bnft_fact_id, bene_cntry_of_brth_id, bene_cntry_of_rsdc_id,