ORA-20001: FLEX-NULL REQUIRED SEGMENT: N, SEGMENT_NAME, 'XX_SEGMENT_NAME' while creating Employee Contact hr_contact_rel_api.create_contact

While creating relationship type contact for employee using hr_contact_rel_api.create_contact API, getting "ORA-20001: FLEX-NULL REQUIRED SEGMENT: N, SEGMENT_NAME, 'XX_SEGMENT_NAME'" error. When you face such error please validate "Further Contact R'ship Info" flex field has any mandatory values as shown in below screenshot.

Please pass value for flex value and test it.