Alert - Container

Hi Experts,

I have defined an alert categoty ZALERT, with 2 elements in the container: VAR1, VAR2.

In the Long text am using these two elements like: Document VAR1 is created by VAR2

The problem is: am getting the alert message as "Document is created by ".

Am executing the alert using FM: SALRT_CREATE_API, am filling the container table with the two elements.

l_tab_container-element     = 'VAR1'.
l_tab_container-tab_index = 1.
l_tab_container-type = 'C'.
l_tab_container-value       = l_doc_type.
APPEND l_tab_container.

l_tab_container-element     = 'VAR2'.
  l_tab_container-tab_index = sy-tabix.
  l_tab_container-type = 'C'.
  l_tab_container-value       = sy-uname.
  APPEND l_tab_container.

CALL FUNCTION 'SALRT_CREATE_API'
 EXPORTING
   ip_category                  = 'ZALERT'   
*   IP_ALIAS                     =
*   IP_EXPIRATION_TIME           =
*   IP_EXPIRATION_DATE           =
   ip_wait_on_commit            = ' '
*   IP_APPLICATION_GUID          =
*   IP_GET_SYNC_EXCEPTIONS       = ' '
*   II_CONTAINER                 =
 IMPORTING
   ep_alert_id                  = l_ep_alert_id
 TABLES
   it_recipients                = l_tab_recipients
*   IT_ACTIVITIES                =
   it_container                 = l_tab_container
   it_ext_recipients            = l_tab_ext_recipients
*   IT_EXT_ADDR                  =
*   IT_ROLES                     =
* EXCEPTIONS
*   ALERT_CATEGORY_UNKNOWN       = 1
*   ALERT_NO_RECIPIENTS          = 2
*   ALERT_ERROR_UNKNOWN          = 3
*   DESTINATION_UNDEFINED        = 4
*   COMMUNICATION_FAILURE        = 5
*   SYSTEM_FAILURE               = 6
*   OTHERS                       = 7
          .

Some one plz help me to get the proper data.

Thank you.