How to update a Z-table in CRM PCUI??

Hello,

I need to display/modify/insert entries of a Z table in the BSP. I read pcui cook book, but I have doubts...

This is my scenario:

Select data from Z-Table in method: IF_CRM_BSP_MODEL_ACCESS_IL~QUERY

Display data in BSP with method: IF_CRM_BSP_MODEL_ACCESS_IL~READ

Insert/Modify data of Z-Table in method: IF_CRM_BSP_MODEL_ACCESS_IL~MODIFY???

Method Modify:

FIELD-SYMBOLS:    <ft_data> TYPE ZTABLE,

                               <fs_new_data> TYPE ZTABLE.

" Mapping table

   ASSIGN it_screen_structure TO <ft_data>.

 

   " Read data from BSP

   READ TABLE <ft_data> INDEX 1 ASSIGNING <fs_new_data>.

 

   " Check if is a new entry

   IF <fs_new_data>-object_key IS INITIAL.

     APPEND ls_new_data TO me->gt_data.

   ENDIF.

 

....

 

     " If is a new entry

     IF <fs_new_data>-object_key IS INITIAL.

 

          " Create GUID

          CALL FUNCTION 'GUID_CREATE'

            IMPORTING

              ev_guid_32 = lv_guid.

  

          " Insert data in ZTABLE

          TRY.

              INSERT ZTABLE FROM ls_zstructure.

            CATCH cx_sy_open_sql_db.

 

          ENDTRY.

     ELSE.

          " Insert data in ZTABLE

          TRY.

              MODIFY ZTABLE FROM ls_zstructure.

            CATCH cx_sy_open_sql_db.

 

          ENDTRY

 

     ENDIF.

Is this correct?

Can you give me explain how to do it and if there is any way to check the data before insert?

Thanks in advance!!

Jose