Defining a table field as radiobutton

Hi experts,

I have a client table with two fields defined as char 1. Now, when creating the screen for SM30, I want these two fields as radiobutton. In the layout, I have created them as radiobutton but now, I don't know how to group them. It understands there are two radiobutton groups, one for each table field. But what I want is to create a group for each table row, only one of the two fields should be marked.

Could you help me, please?

Thanks in advance,

Ainara.