Create new tab in header using badi ME_GUI_PO_CUST for tcode ME21N

Question

Dear all,
i have implemented method SUBSCRIBE in ME_GUI_PO_CUST to create new tab in ME21N,
but the tab is not coming
following is the code snips, please tell where is the error, or some setting needs to be done
method IF_EX_ME_GUI_PO_CUST~SUBSCRIBE.
DATA: ls_subscriber LIKE LINE OF re_subscribers.
if sy-tcode eq ' ME21N' OR SY-TCODE EQ 'ME22N' OR SY-TCODE EQ 'ME23N'.
  CHECK im_application = 'PO'.
  CHECK im_element     = 'HEADER'.
CLEAR re_subscribers[].
  ls_subscriber-name = 'Customer-Data'.
  ls_subscriber-dynpro = '0101'.
  ls_subscriber-program = 'SAPLMEGUI'.
  ls_subscriber-struct_name = 'MEPO_SUBSCRIBERS'.
  ls_subscriber-label = 'Customer Data'.
  ls_subscriber-position = 10.
  ls_subscriber-height = 7.
  APPEND ls_subscriber TO re_subscribers.
ENDIF.
endmethod.
Regards
Sumodh

Answer 1

Hi...I hv similar requirement.
I need to show a custom field in the screen for the items.
I tried using the methods "SUBSCRIBE" and "MAP_DYNPRO_FIELDS" as explained in the sample code.
Below is my code. I have copied the sample code and changed it lil.
Method "SUBSCRIBE":
  DATA: ls_subscriber LIKE LINE OF re_subscribers.
we want to add a customer subscreen on the item detail tab
  CHECK im_application = 'PO'.
  CHECK im_element     = 'ITEM'.
each line in re_subscribers generates a subscreen. We add one subscreen in this example
  CLEAR re_subscribers[].
the name is a unique identifier for the subscreen and defined in this class definition
  ls_subscriber-name = subscreen1.
the dynpro number to use
  ls_subscriber-dynpro = '9000'.
the program where the dynpro can be found
  ls_subscriber-program = 'SAPLZMMPO1'.
each subscreen needs his own DDIC-Structure
  ls_subscriber-struct_name = 'ZMM_PO_CUST_SCREEN'.
a label can be defined
  ls_subscriber-label = text-t01.
the position within the tabstrib can be defined
  ls_subscriber-position = 13.
the height of the screen can be defined here. Currently we suport two screen sizes:
value <= 7 a sevel line subscreen
value > 7  a 16 line subscreen
  ls_subscriber-height = 7.
  APPEND ls_subscriber TO re_subscribers.
method "MAP_DYNPRO_FIELDS":
  FIELD-SYMBOLS: <mapping> LIKE LINE OF ch_mapping.
*- customer fields
  CONSTANTS: mmmfd_cust_01 TYPE mmpur_metafield VALUE 90000000.
  LOOP AT ch_mapping ASSIGNING <mapping>.
    CASE <mapping>-fieldname.
      WHEN 'CLMNO'. <mapping>-metafield = mmmfd_cust_01.
    ENDCASE.
  ENDLOOP.
I created a function group - "ZMMPO1" and created the subscreen 9000 in that. I placed the custom field in that screen. Tha main program of ZMMPO1 is "SAPLZMMPO1".
I created a structure also - "ZMM_PO_CUST_SCREEN".
I want to know whether this is sufficient to display the tab on the screen or am I missing something.
It is mentioned that the implementation of "ME_PROCESS_PO_CUST" is a pre-requisite.
could you lemme know the process please.
Thanks,
Ram.