ORA-31685 Error while import using IMPDP

Got a ORA-31685 error on schema import with remap option.

ORA-31685: Object type REF_CONSTRAINT:"DIGITAL"."FK_SEVERITY" failed due to insufficient privileges.
Failing sql is: ALTER TABLE "DIGITAL"."DIGITAL_ALLERGYGRPTRANSACTION" ADD CONSTRAINT "FK_SEVERITY" FOREIGN KEY ("SEVERITYID") REFERENCES "EHIS"."ALLERGYSEVERITYMASTER" ("ALLERGYSEVERITYID") ENABLE

I tried in many ways to create FOREIGN KEY but still its showing insufficient privileges error. Finally I get to know that its below grant issue.

grant REFERENCES on EHIS.ALLERGYSEVERITYMASTER to DIGITAL;

Hope this will help you.