Not authorized error using sequence in procedure

Hi folks,

When I run this SQL via SQL editor it works fine;

INSERT INTO "MySchema"."CATEGORY" (CategoryID, Category) VALUES ("MySchema"."SEQ_CATEGORY".NEXTVAL, 'TEST5');

When I place this into a hdbprocedure and debug I get 'insufficient privilege not authorized'.

PROCEDURE "MySchema"."myPath::test" ( )

  LANGUAGE SQLSCRIPT

  SQL SECURITY DEFINER AS          

BEGIN

INSERT INTO "MySchema"."CATEGORY" (CategoryID, Category) VALUES ("MySchema"."SEQ_CATEGORY".NEXTVAL, 'TEST5');

END;

I have full access to this schema and if I change the insert so that it does not use sequence it inserts fine into this schema.  But when I add the sequence I get authorization error.  Do I need to give additional access to some other system user in order to do this?

Thanks,

-Patrick