how to create f4 button to display required fields

Hi abapers, I am working on abap hr now .I displayed entity code( ENT_CODE) from table ZTE_AIRLINE_STG as parameter on selection screen(filter criteria). when we press F4(create f4 )button on ENT_CODE this field will display only this fields Entity Code (ATR, DC, Tax, FAS, SVCS) Pease give me reply as soon as posibel. today is my dead line date.

HI experts,

I did my self only the output come this . i dont want this ,i want sigle values.please tell me how solve this.