Use UDT with specified database in a document that use another database

Question

If I use the the current database named test

USE [test]
GO

DECLARE @test [dbo].[work]

in the file named tt.sql

DECLARE @test [dbo].[work]

It works

However, if I use the code "DECLARE @test [dbo].[work]" only

in another document that use another database (USE [abcd]) named abcd

then I need to add [test].[dbo].[work] but it doesn't work.

What am I missing?

Thank you!