ALV column with search capability

All,
When you create an ALV grid with a field of type like mara-matnr you have a button automatically inserted in the cell and when you click on it, you have the standard search for materials and you can list/select all the materials you want.
I would like to have the same for jurisdiction code but when I define the field like TTXJ-TXJCD, there is no search capability attached in the cell.
Does anyone knows how to do this?

John,
I created an elementary Search Help with selection method on table 'TTXJ' .
I applied this Search Help to a new custom domain I created and finally I assigned this domain to a field of a custom table I had.
Unfortunately, I have no list in the ALV grid.
Is there something else you believe I should do?
Thanks,
Isabelle

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