Attaching a search help to a selection screen "Select-options"

Hello ABAPers,

I have a requirement to attach a search help to "select-options" .

When I checked the table corresponding to the field of select-options,I found that there is no search help assigned for that field.

I have tried using AT Selection-screenON VALUE-REQUEST and Matchcode Object .

However, Matchcode Object requests for standard search help name.

On value-request assign shelp only for the lower linit,but on pressing F4, gives no values found.

Tried using the FM F4IF_INT_TABLE_VALUE_REQUEST also. But this is for the POV event.

Could anyone please suggest a solution for this problem?