On Value Request Problem

Question

When I use On Value request for sel_op_fielda, I need to validate another field in my selection screen.... ( Sel_op_fieldb-low in case of this example)
It's... not working. When debbuging the Sel_opfieldb keeps comming initial.
Am I forgotting something?

Answer 1

Header line and itab.... both Initial.
I debbuged a standard program and saw it using de Function Indicated by our friend here.
Function: DYNP_VALUES_READ
But still my CN_'s comming Initial.
Code Below:
Data: ti_campos like table of DYNPREAD WITH HEADER LINE,
      l_repid like sy-repid.
      l_repid = sy-repid.
      ti_campos-FIELDNAME = 'CN_PROJN-LOW'.
      append ti_campos.
      ti_campos-FIELDNAME = 'CN_PROJN-HIGH'.
      append ti_campos.
      ti_campos-FIELDNAME = 'CN_NETNR-LOW'.
      append ti_campos.
      ti_campos-FIELDNAME = 'CN_NETNR-HIGH'.
      append ti_campos.
      ti_campos-FIELDNAME = 'CN_PSPNR-LOW'.
      append ti_campos.
      ti_campos-FIELDNAME = 'CN_PSPNR-HIGH'.
      append ti_campos.
CALL FUNCTION 'DYNP_VALUES_READ'
  EXPORTING
    dyname                         = l_repid
    dynumb                         = sy-dynnr
  TRANSLATE_TO_UPPER             = ' '
  REQUEST                        = ' '
PERFORM_CONVERSION_EXITS       = ' '
PERFORM_INPUT_CONVERSION       = ' '
  DETERMINE_LOOP_INDEX           = ' '
  tables
    dynpfields                     = ti_campos
EXCEPTIONS
   INVALID_ABAPWORKAREA           = 1
   INVALID_DYNPROFIELD            = 2
   INVALID_DYNPRONAME             = 3
   INVALID_DYNPRONUMMER           = 4
   INVALID_REQUEST                = 5
   NO_FIELDDESCRIPTION            = 6
   INVALID_PARAMETER              = 7
   UNDEFIND_ERROR                 = 8
   DOUBLE_CONVERSION              = 9
   STEPL_NOT_FOUND                = 10
   OTHERS                         = 11.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Message was edited by:
        Jose Oliveira