Unable to grant certain privs using sproc - error 3524

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Unable to grant certain privs using sproc - error 3524

I've created a stored procedure to grant certain privs but I get error 3524 for some of them.  I've created the sproc and am owner and creator.  I'm creator of the target db.  I can grant the privs directly via sql asst or use td administrator but when I call sproc from same session I get the error.  I've granted the privs with grant option to the owner/creator and still get error.

sql asst:

logged on as sysdba.  sysdba is creator and owner of sproc.   sysdba is creator of my_tables db.  when called, sproc is doing the following:

call sysdba.sysexecsql ('GRANT create function ON my_tables to my_role'); 

CALL Failed. 3524:  SYSEXECSQL:The user does not have CREATE FUNCTION WITH GRANT OPTION access to database my_tables. 

I've granted create function with grant option to sysdba and dbc and still get above error.

It works when I grant it directly from my sql asst session:

grant create function on my_tables to a_role: works

Any ideas?