Implementing badi ME_GUI_PO_CUST

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Hi,

I created implementation for the badi ME_GUI_PO_CUST.

In the method IF_EX_ME_GUI_PO_CUST~SUBSCRIBE

I've written the below code

***

DATA: ls_subscriber LIKE LINE OF re_subscribers.

CHECK im_application = 'PO'.

CHECK im_element = 'HEADER'.

CLEAR re_subscribers[].

ls_subscriber-name = subscreen1.

ls_subscriber-dynpro = '9000'.

ls_subscriber-program = 'SAPMZTEST'.

ls_subscriber-struct_name = 'MEPO_BADI_STRUCT'.

ls_subscriber-label = 'New'.

ls_subscriber-position = 5.

ls_subscriber-height = 7.

APPEND ls_subscriber TO re_subscribers.

****

I've created one module pool program SAPMZTEST and a sub screen 9000 for that program .

If it is not the correct procedure pls guide me.

I could not see a new tab in PO header. Could anyone pls let me know what should I do to get a new tab?

Thanks,

Poornima