SQL & PL/SQL :: View Definition With Schema Name?

I have a view in schema 'sales', let say the view name is view_test.

This view sales.view_test uses two base tables, one from schema 'products' and other from its own schema 'sales'.

So in sales schema the view defination is,

create or replace view view_test
as
select * from t_test, products.t_products
where t_test.id=t_products.id

The view got created, I have granted select permisson with grant option on tables t_test, products.t_products and view_test to another user 'master'.But when i query the view from master schema I get an error saying that the view does not exists, upon analysis, I found one of the base table in the view defination has no schema name mentioned (select * from t_test, products.t_products --here only t_test mentioned rather sales.t_test), I feel because the table t_test belongs to the same schmea of the view, they did not mention the schema name. If not, does it mean that we need to always specify the schema names in the view defination for the base tables.