What I have to change ?
- SE11, open the table
- Change the field type using a Data Element
- Create a Domain from those data element.
- This is the important thing : Tick the Lowercase option.

What I have to change ?

1. Create RFC Destination
2. SE37 - Function TABLE_ENTRIES_GET_VIA_RFC RFC
Target sys : input the RFC Destination

You can use WHERE clause in this field :

The Structure stored in NAMETAB
The Records stored in TABENTRY
1 record will be store in 1 string, so u need to offset them by their structure.