Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Documents (document_name VARCHAR, template_id VARCHAR)
TABLE: CREATE TABLE Templates (template_id VARCHAR, template_type_code VARCHAR)

### Question ###
Show all document names using templates with template type code BK.

### Accurate SQL ###

SELECT T2.document_name FROM Templates AS T1 JOIN Documents AS T2 ON T1.template_id = T2.template_id WHERE T1.template_type_code = "BK"