Following code is working fine.By appending the fields we can pass more than one field to popup.Thanks Raymond .Thanks to all of you .
tables : pa0001.
*START-OF-SELECTION.
*— Prepare Parameters for FM ————-*
t_fields-tabname = 'PA0001'.
t_fields-fieldname = 'PERNR'.
APPEND t_fields.
*—- Function Module Call —————–*
CALL FUNCTION 'POPUP_GET_VALUES'
EXPORTING
* NO_VALUE_CHECK = ' '
POPUP_TITLE = 'Test Popup'
* START_COLUMN = '5'
* START_ROW = '5'
* IMPORTING
* RETURNCODE =
TABLES
FIELDS = t_fields
* EXCEPTIONS
* ERROR_IN_FIELDS = 1
* OTHERS = 2
.
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
* WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.