Select only 2 type in selection screen

Question

i have a parameter called zzzzz
i want that the user can chosse only '99' and '88'
how i do it?
thanks.

Answer 1

GIVE AN OPTION TO SELECT FROM THE 2 VALUES USING THE FUNCTION MODULE "'F4IF_INT_TABLE_VALUE_REQUEST" AND DO THE VALIDATION TO CHECK IF IT ONE OF THOSE VALUES OR NOT ,THIS WAY THE USER WILL HAVE TO SELECT FROM THE 2 VALUES ONLY .BELOW IS THE CODE.
initialization.
PARAMETERS :   zzzz(20).
data : tab type standard table of zstr1 with header line,
       rettab type standard table of  DDSHRETVAL with header line.
tab-name = '98'.
append  tab.
tab-name ='99'.
append  tab.
*DATA : TAB(20) type c occurs 0 with header line.
*at selection-screen output.
at selection-screen on value-request for zzzz.
                        CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
                          EXPORTING
                            RETFIELD               = 'NAME'
                           VALUE_ORG              = 'S'
                           CALLBACK_PROGRAM       = sy-cprog
                          TABLES
                            VALUE_TAB              = tab
                           RETURN_TAB             =  rettab.
                        IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
                        ENDIF.
zzzz = rettab-fieldval .
at selection-screen on ZZZZ.
if rettab-fieldval <> 98 AND rettab-fieldval <> 99.
message e001(zmessage1).
else.
zzzz = rettab-fieldval .
endif.<i></i><i></i><i></i>