Hi Ice
Change the code as shown below
lwa_fieldtab-fieldname = 'NUM'.
lwa_fieldtab-intlen = 4.
lwa_fieldtab-outputlen = 4.
lwa_fieldtab-scrtext_m = 'Number'.
APPEND lwa_fieldtab TO ltt_fieldtab.
lwa_fieldtab-fieldname = 'TEXT'.
lwa_fieldtab-intlen = 60.
lwa_fieldtab-outputlen = 60.
lwa_fieldtab-OFFSET = 4.
lwa_fieldtab-scrtext_m = 'Description'.
APPEND lwa_fieldtab TO ltt_fieldtab.
CALLFUNCTION'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'NUM'
dynpprog = sy-repid
dynpnr = sy-dynnr
dynprofield = 'S_NUMBER'
window_title = 'Number'
value_org = 'S'
TABLES
field_tab = ltt_fieldtab
value_tab = gtt_number.