How to catch excpetions of function module?

Question

Hallo everybody,
how can i catch the exception from function module "exception" and deliver it to call function parameter table --exception table.
For example,a function module 'RPY_TABLE_INSERT' is called by Call Function (parameter_table)in order to create a new table.When the table exists already, a exception "Already_exist" activated.But it can not be caught,since it is raised by "message raise". Therefore in the exception-table of caller no error is caught.
How can I deal with it?
Thanks in advance!
Message was edited by: Liying Wang

Answer 1

CALL FUNCTION 'RPY_TABLE_INSERT'
  EXPORTING
  LANGUAGE                = SY-LANGU
    TABLE_NAME              =
  WITH_DOCU               = ' '
  DOCUTYPE                = 'T'
  TRANSPORT_NUMBER        = ' '
  DEVELOPMENT_CLASS       = '$TMP'
    TABL_INF                =
  TABL_TECHNICS           = ' '
  TABLES
    TABL_FIELDS             =
  DOCU_TABLE_USER         =
  DOCU_TABLE_TECH         =
EXCEPTIONS
  CANCELLED               = 1
  ALREADY_EXIST           = 2
  PERMISSION_ERROR        = 3
  NAME_NOT_ALLOWED        = 4
  NAME_CONFLICT           = 5
  DB_ACCESS_ERROR         = 6
  OTHERS                  = 7
IF SY-SUBRC <> 0.
  as per the error sy-subrc will be set, you can see in the exceptions ( 1 for cancel, 2 for already exit)
so using this subrc you can determine the error
ENDIF.