Hi,
You will get all the details in CAWN table but they will be stored in internal format.
Use Bapi 'BAPI_CHARACT_GETDETAIL' to get the possible values, you can get all the values and its description in Tables parameter 'CHARACTVALUESDESCR'.
You have to do the following.
When ever any value entered in the selection screen field.
In F4 logic for that field, read the entered value from the selection screen using fm 'DYNP_VALUES_READ'. If the field is not blank. Pass the value to the BAPI 'BAPI_CHARACT_GETDETAIL'.
Now move all the entries into an internal table and call fm 'F4IF_INT_TABLE_VALUE_REQUEST'.
Thanks & Regards
Bala Krishna