SQL automatically changes to uppercase on user defined LOV query under Manage List Of Values Sources

Summary:

SQL automatically changes to uppercase on user defined LOV query under Manage List Of Values Sources

Content (required):

I have entered below SQL on the Query box for a user defined LOV query under Manage List Of Values Sources:

SELECT ROWNUM AS LOV_ID, COLUMN1 FROM (SELECT 'Header' COLUMN1 FROM DUAL

UNION 

SELECT 'Line' COLUMN1 FROM DUAL)

But once saved, the query automatically changed to uppercase as below:

SELECT ROWNUM AS LOV_ID, COLUMN1 FROM (SELECT 'HEADER' COLUMN1 FROM DUAL

UNION 

SELECT 'LINE' COLUMN1 FROM DUAL)

I need case sensitive data on my job while selecting the parameter and on the output.