SQL Developer

Hi, I am using oracle sql developer which is a great help for migration. While migrating a schema, in converted ddl i got the code as follows:

ADD CONSTRAINT <constraint name> CHECK

(

  ( ENDTIME = utils.dateadd('MINUTE', DURATION, STARTTIME) )

)

ENABLE

when i ran this in oracle connection, i got below error:

Error Report -

SQL Error: ORA-00904:"UTILS". "DATEADD": invalid identifier

00904 00000 - "%s: invalid identifier"

I have already checked this in "utils" from "Emulation" user. Please check it as follows:

FUNCTION DATEADD(P_INTERVAL IN VARCHAR2, P_INTERVAL_VAL IN NUMBER, P_DATE_STR IN VARCHAR2) RETURN TIMESTAMP;

FUNCTION DATEADD(P_INTERVAL IN VARCHAR2, P_INTERVAL_VAL IN NUMBER, P_DATE_EXPR IN DATE) RETURN DATE;

FUNCTION DATEADD(P_INTERVAL IN VARCHAR2, P_INTERVAL_VAL IN NUMBER, P_DATE_EXPR IN TIMESTAMP) RETURN TIMESTAMP;

FUNCTION DATEADD(P_INTERVAL IN VARCHAR2, P_INTERVAL_VAL IN NUMBER, P_DATE_EXPR IN TIMESTAMP WITH TIME ZONE) RETURN TIMESTAMP WITH TIME ZONE;

I need help to fix this error.