Insert Into Select From Another Schema?

I have a schema northwind which has tables and then i have another schema northwind_staging which has its own tables.
CREATE TABLE "NORTHWIND"."CUSTOMERS"
(
"CUSTOMERID" VARCHAR2(5 CHAR),
"COMPANYNAME" VARCHAR2(40 CHAR) NOT NULL ENABLE,
"CONTACTNAME" VARCHAR2(30 CHAR),
"CONTACTTITLE" VARCHAR2(30 CHAR),
"ADDRESS" VARCHAR2(60 CHAR),

[code]...

I created a procedure

CONNECT NORTHWIND_STAGING/NENAGH1;
create or replace procedure INSERTCUSTOMERS_STAGING
as
begin
INSERT INTO NORTHWIND_STAGING.customers_staging
SELECT DISTINCT c.customerid, c.companyname,c.contactname,c.region, c.country
FROM NORTHWIND.CUSTOMERS c;
end;
/

show errors This works fine when i ran my test scripts in SQL developer. I created a role Select on Northwind