How to display RFC-Logon-Screen for non trusted connection in Web-Dynpro?

Question

Dear Web-Dynpro-Specialists,
i got a issue while creation of an WebDynpro-Tool, which is using RFC connections for reading data.
In some cases the RFC connection is not a trusted one connection, so a login is nessessary, but in
this cases not a window is coming up for login....
Any idea how i can get this window for login, in order to collect the nessessary Data for my tool?
Additional Information concerning the RFC connection:
While running my Web-Dynpro i run this Method:
METHOD get_table_entries.
CLEAR rt_entries[].
CALL FUNCTION 'RFC_GET_TABLE_ENTRIES'
DESTINATION iv_destination
EXPORTING
gen_key = iv_table_key
table_name = iv_table_name
TABLES
entries = rt_entries
EXCEPTIONS
internal_error = 1
table_empty = 2
table_not_found = 3
OTHERS = 4.
CASE sy-subrc.
WHEN 1.
RAISE internal_error.
WHEN 2.
RAISE table_empty.
WHEN 3.
RAISE table_not_found.
WHEN 4.
RAISE unknown_error.
ENDCASE.
ENDMETHOD.
Thanks a lot in advance
Best regards
Carsten Klatt

Answer 1

Hi!
You can use the function module RFC_MODIFY_R3_DESTINATION to create, modify and delete RFC connections. You will need the system ID (e.g. ABC), client (e.g. 123), system number (e.g. 00) and the host name of the server. In this example the following code would create or modify the RFC destination ZRFC_DESTINATION.
    CALL FUNCTION 'RFC_MODIFY_R3_DESTINATION'
      EXPORTING
        destination                = 'ZRFC_DESTINATION'
        action                     = 'M'
        systemid                   = 'ABC'
        systemnr                   = '00'
        server                     = 'serverhostname'
        language                   = sy-langu
        client                     = '123'
        user                       = 'USERNAME'
        password                   = 'PASSWORD'
        description                = 'Dummy RFC Connection'
      EXCEPTIONS
        authority_not_available    = 1
        destination_already_exist  = 2
        destination_not_exist      = 3
        destination_enqueue_reject = 4
        information_failure        = 5
        trfc_entry_invalid         = 6
        internal_failure           = 7
        snc_information_failure    = 8
        snc_internal_failure       = 9
        destination_is_locked      = 10
        OTHERS                     = 11.
With the following code you can delete this connection:
    CALL FUNCTION 'RFC_MODIFY_R3_DESTINATION'
      EXPORTING
        destination                = 'ZRFC_DESTINATION'
        action                     = 'D'
      EXCEPTIONS
        authority_not_available    = 1
        destination_already_exist  = 2
        destination_not_exist      = 3
        destination_enqueue_reject = 4
        information_failure        = 5
        trfc_entry_invalid         = 6
        internal_failure           = 7
        snc_information_failure    = 8
        snc_internal_failure       = 9
        destination_is_locked      = 10
        OTHERS                     = 11.
Please keep in mind that deleting an RFC connection is usually noted in the system log.
If you want to reuse your connection for multiple servers, you could run into trouble since connection data is cached.
Sincerely,
Stefan