Drop down list in Table Control - Value disappeared after pressing ENTER

Dear Gurus,
I have a problem in one of my development where I used a table control in which one field is a drop down list.
I used VRM_SET_VALUES and VRM_GET_VALUES for populating the values from the programand not use any domain level value table for that field.
My problem is when I select one value from this list , and pressing enter , the value get disappeared. But if I use a domain for this field with value table then everything working properly.
My doubt is am I doing some miss coding or using the VRM_ function modules improperly ?
I am sharing some code with you
in PAI :
CALL FUNCTION 'VRM_GET_VALUES'
    EXPORTING
      id            = 'ITAB-FIELD3'    "This is drop down list element on screen
    IMPORTING
      values        = values[]    " even it is not the expor parameter...it will work..
   EXCEPTIONS
     id_not_found   = 1
     OTHERS         = 2.
  IF sy-subrc NE 0.
  No sy-subrc check required.
  ENDIF.
IN PBO
CALL FUNCTION 'VRM_SET_VALUES'
       EXPORTING
            id     = 'IVBAP-ERNAM'
            values = values[].
Can you please help me.
Thanks .

HI,
The link contains the list box creation, just check if this might help.
Re: Getting values back from a listbox.
Regards and Best wishes.

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