List UIBB - Multi Field Search Help Value Assignment!

Hi,

I have editable list UIBB (FPM_LIST_UIBB_ATS), in which I have below two columns:

1. COUNTRY_KEY

2. COUNTRY_DESC

And, I have a Search Help that exports below two parameters

1. KEY

2. TEXT

Now, I would like to mark the list table COUNTRY_KEY as hidden/technical field and only show COUNTRY_DESC column to the user. And if they change the value COUNTRY_DESC using the above Search Help then the corresponding value for COUNTRY_KEY should also get updated.

I tried playing with the GET_DEFINITION methods ET_FIELD_DESCRIPTION parameters (*_REF) but with no luck.

Is this possible? If so, then how?

Thanks!