Oracle DBMS_FGA dynamically create an audit trail or policy - oracle

Question

my goal is to run a select to a table and based on the certain rows dynamically create an audit trail or policy on them.
so..
create a set_policy function that gets called/Looped:
create or replace
function set_policy
( sch VARCHAR2 ,
tab VARCHAR2,
colm VARCHAR2,
pred VARCHAR2,
emailer VARCHAR2
)
return VARCHAR2 is
policy_sql_stmt varchar2(1000);
BEGIN
policy_sql_stmt :=
'BEGIN
SYS.DBMS_FGA.ADD_POLICY (
object_schema => :s,
object_name => :t,
policy_name => ''CHK_:s_:t'',
audit_column => :c,
audit_condition => :p,
handler_schema => ''SYSADMIN_FGA'',
handler_module => '''||emailer||'(:s,:t,''''CHK_:s_:t'''')'',
enable => TRUE,
statement_types => ''SELECT, UPDATE'',
audit_trail => SYS.DBMS_FGA.DB + SYS.DBMS_FGA.EXTENDED);
END;';
--DBMS_OUTPUT.PUT_LINE('policy_sql_stmt = :' || policy_sql_stmt);
BEGIN
EXECUTE IMMEDIATE policy_sql_stmt USING sch,tab,colm,pred;
--EXECUTE IMMEDIATE policy_sql_stmt USING pred;
EXCEPTION
WHEN OTHERS THEN
BEGIN
--dbms_output.put_line('set_policy error code: '||SQLCODE);
--dbms_output.put_line(DBMS_UTILITY.FORMAT_CALL_STACK);
RETURN ('set_policy error code: '||SQLCODE);
END;
END;
RETURN 'success';
END;
Then a procedure that calls the function...
CREATE OR REPLACE PROCEDURE audit_slac_tables
AS
--DECLARE
emailer VARCHAR2(40):='audit_email_alert';
isSuccess VARCHAR2(40);
CURSOR myCursor
IS
SELECT SCHEMA AS sch,
TABLE_NAME AS tab,
FILTER_COLUMN AS colm,
WHERE_COND AS pred
FROM SLAC_REDACTION_TABLE slac;
--WHERE slac.table_name IN ('RECIPIENT','CARD');
BEGIN
FOR curRec IN myCursor
LOOP
BEGIN
--emailer := getEmailer(curRec.sch ,curRec.tab);
isSuccess := set_policy(curRec.sch ,curRec.tab, curRec.colm, curRec.pred, emailer);
DBMS_OUTPUT.PUT_LINE('Proc isSuccess = :' || isSuccess);
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Proc error code: '||SQLCODE);
dbms_output.put_line('Proc error msg: '||SQLERRM);
--dbms_output.put_line(DBMS_UTILITY.FORMAT_CALL_STACK);
--dbms_output.put_line('================================================');
CONTINUE;
END;
--dbms_output.put_line('================================================');
END LOOP;
COMMIT;
END audit_slac_tables;
if I call it...
exec AUDIT_SLAC_TABLES;
I get the following bewildering error
Error starting at line : 6 in command -
exec AUDIT_SLAC_TABLES
Error report -
ORA-06550: line 12, column 18:
PLS-00201: identifier 'SYS.DBMS_FGA' must be declared
ORA-06550: line 2, column 3:
PL/SQL: Statement ignored
ORA-06512: at "GAPLITE.SET_POLICY", line 51
ORA-06512: at "GAPLITE.AUDIT_SLAC_TABLES", line 27
ORA-06512: at line 1
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
Why a reference problem where the script DBMS_FGA.ADD_POLICY never had a problem?
I can run this script ( listed 1st above ) but not dynamically... it loses trhe contextual reference to the SYS packages somehow ??