Change field contents (from SM30) from uppercase to as it is.

One day, my user need to maintain 1 table from SM30, when they entered a description of tax service code, it changed automatically to upper case caps. Actually they need that description as it is.

What I have to change ?

1. SE11, open the table
2. Change the field type using a Data Element
3. Create a Domain from those data element.
4. This is the important thing : Tick the Lowercase option.

The Lowercase option means let the word as it is, not changed to uppercase caps.