Problems with TRANSPORT_FROM_MODEL in BADI ME_GUI_PO_CUST

Hello,
I tried implementing the BADI ME_GUI_PO_CUST along with all it's methods and subsequently I also got the custom screen visible in PO header. But problem is whenever I click on this subscreen, the code for the method TRANSPORT_FROM_MODEL doesn't trigger. Instead, it triggers TRANSPORT_TO_DYNP and understandably the methods does nothing because it couldn't fetch any data. Kindly help understanding why TRANSPORT_FROM_MODEL doesn't trigger when I click on the custom tab at PO header and how can I correct the same?
Thanks,
Manuel Chiarelli

Hi Abhishek
but how did You solve this problem. I have the same ...
Kindly,
Wolf-Peter

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Hi,
I implemented BADI's ME_GUI_PO_CUST and ME_PROCESS_PO_CUST to show a custom tab in the header section of ME21N, ME22N and ME23N.
But after implementing the BADI's, the tab showed up in ME23N, but not in ME21N and ME22N.
So I started looking for a solution in the SDN forum, and I saw that there were a LOT of people with the same problem, but nobody ever posted a solution.
So here is the solution:
So, I added the fields I wanted to show in the structure CI_EKKODB, implemented the BADI ME_GUI_PO_CUST (the methods SUBSCRIBE and MAP_DYNPRO_FIELDS), and the BADI ME_PROCESS_PO_CUST.
After that the tab showed up in ME23N, not in ME21N or ME22N.
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Question:
I implemented the 'ME_GUI_PO_CUST' Business Add-In to display customer-
specific tab titles in the EnjoySAP purchase order. They are only shown in display mode (ME23N) however, not in create or change. Why?
Solution:
You may have forgotten to assign a field status to the user-defined fields on these tabs. As a result, the system automatically interprets the field status as 'hidden' in create and change modes. However if a tab contains only hidden fields, then the entire tab is set to hidden. In display mode, fields without a field status are automatically set to display. That is why the tab is displayed in this case.
To assign a field status to the user-defined fields, use the methods provided for this purpose in the Business Add-In 'ME_PROCESS_PO_CUST' (compare sample source code in the FIELDSELECTION_ITEM method).
So in my case, I had to add some code to the FIELDSELECTION_HEADER method of the BADI ME_PROCESS_PO_CUST.
This is the code:
method IF_EX_ME_PROCESS_PO_CUST~FIELDSELECTION_HEADER.
DATA: l_persistent TYPE mmpur_bool.
FIELD-SYMBOLS: <fs> LIKE LINE OF ch_fieldselection.
* if the item is already on the database, we disallow to change field badi_bsgru
l_persistent = im_header->is_persistent( ).
*   IF l_persistent EQ mmpur_yes.
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    IF sy-subrc IS INITIAL.
      <fs>-fieldstatus = '*'. " Input
    ENDIF.
*   ENDIF.
endmethod.
But then, I realized that this BADI was never triggered. When I entered one of the transaction codes ME21N, ME22N or ME23N, the code in the fieldselection_header method was never executed.
So I went to transaction SE18, and entered ME_PROCESS_PO_CUST in 'Enhancement Spot' and pushed the button display.
And there in the tab 'Enhancement Implementations', I saw an implementation that was not mine, and that did not show up in the overview of the SE18 'BADI NAME' tab for the same BADI... which to me seems strange.
So as you may know, there can never be more than one active implementation of the BADI ME_PROCESS_PO_CUST.
So I disactivated my implementation and put my code in the existing implementation.
And after that it worked!

implement first badi :ZME_GUI_PO_CUST:
METHOD if_ex_me_gui_po_cust~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     = 'HEADER'.
* each line in re_subscribers generates a subscreen. We add one subscreen in this example
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* the dynpro number to use
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* the program where the dynpro can be found
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* each subscreen needs his own DDIC-Structure
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* a label can be defined
   ls_subscriber-label = text-001.
* the position within the tabstrib can be defined
   ls_subscriber-position = 4.
* 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
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ENDMETHOD.
implement 2nd badi : ZME_PROCESS_PO_CUST:
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   l_persistent = im_header->is_persistent( ).
*   IF l_persistent EQ mmpur_yes.
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*   ENDIF.
endmethod.

Problem on Implementing badi ME_GUI_PO_CUST

Hi Expert,
I have implement BADI ME_GUI_PO_CUST, to add the new tab.
I have managed to View the tab in Both ME21N, and ME22N with implement SUBSCRIBE and MAP_DYNPRO_FIELDS.
method IF_EX_ME_GUI_PO_CUST~SUBSCRIBE
DATA: ls_subscriber LIKE LINE OF re_subscribers.
CHECK im_application = 'PO'.
CHECK im_element = 'ITEM'.
CLEAR re_subscribers[].
ls_subscriber-name = subscreen1.
ls_subscriber-dynpro = '0002'.
ls_subscriber-program = 'ZRPP_ME_GUI_PO_CUST_SCREEN'.
ls_subscriber-struct_name = 'CI_EKPODB'.
ls_subscriber-label = text-001.
ls_subscriber-position = 7.
ls_subscriber-height = 7.
APPEND ls_subscriber TO re_subscribers.
METHOD : IF_EX_ME_GUI_PO_CUST~MAP_DYNPRO_FIELDS
FIELD-SYMBOLS: <mapping> LIKE LINE OF ch_mapping.
LOOP AT ch_mapping ASSIGNING <mapping>.
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ENDLOOP.
Method IF_EX_ME_GUI_PO_CUST~MAP_DYNPRO_FIELDS
DATA: lw_fieldselection LIKE LINE OF ch_fieldselection.
LOOP AT ch_fieldselection INTO lw_fieldselection.
    lw_fieldselection-fieldstatus = '+'.
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ENDLOOP.
I need to store the value, and some of thread said it required methods:
TRANSPORT_FROM_MODEL
TRANSPORT_TO_DYNP
TRANSPORT_FROM_DYNP
TRANSPORT_TO_MODEL
I have click on the subcreen, or enter at the field, but it will not able to trigger the Above Methods.
How do I do for the to trigger above Methods? Or Should I added some additional code at screen program? I want SAVE the data actually into EKPO.
Thanks in advance.

Hi Sim,
Recently we have the same reqirement.
You can have a look at the below code..
First method: SUBSCRIBE
DATA: ls_subscriber LIKE LINE OF re_subscribers.* we want to add a customer subscreen on the Header tab
    CHECK im_application = 'PO'.
    CHECK im_element     = 'HEADER'.* each line in re_subscribers generates a subscreen. We add one subscreen in this example
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* 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 = '0001'.
* the program where the dynpro can be found
    ls_subscriber-program = 'SAPLZKMMM_KAU86037'.
* each subscreen needs his own DDIC-Structure
    ls_subscriber-struct_name = 'CI_EKKODB'.
* a label can be defined
    ls_subscriber-label = text-001.
* the position within the tabstrib can be defined
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* 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.Here, parameter u2018im_elementu2019 is defined as u2018HEADERu2019 as we are adding new tab in header section of PO.
Define a function group and take the main program and define it in ls_subscriber-program.
Also define a sub screen with the required fields and assign it to the parameter ls_subscriber-dynpro.
Then method MAP_DYNPRO_FIELDS
FIELD-SYMBOLS: <mapping> LIKE LINE OF ch_mapping.
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DATA:     l_header       TYPE REF TO if_purchase_order_mm,
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* system asks to transport data from the business logic into the view
*--------------------------------------------------------------------*    CASE im_name.      WHEN subscreen1.* is it an Header? im_model can be header or item.
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Define a FM 'ZK_KAU86037_PUSH' to push the values.CASE im_name.      WHEN subscreen1.        CALL FUNCTION 'ZK_KAU86037_PUSH'
          EXPORTING
            im_dynp_data = dynp_data_pbo.      WHEN OTHERS.
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Define another FM 'ZK_KAU86037_POP'.CASE im_name.      WHEN subscreen1.        CALL FUNCTION 'ZK_KAU86037_POP'
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* something has changed therefore we have to notify the framework
* to transport data to the model
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          l_po_header_handle   TYPE REF TO cl_po_header_handle_mm.*--------------------------------------------------------------------*
* data have to be transported to business logic
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        IF dynp_data_pbo-zzpayment_agre   NE dynp_data_pai-zzpayment_agre
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          ls_mepoheader-zzproject = dynp_data_pai-zzproject.
          CALL METHOD l_header->set_data
            EXPORTING
              im_data = ls_mepoheader.
        ENDIF.
      WHEN OTHERS.    ENDCASE.
Then we have to implement one more BADI to display the tab and update the values.
Implement the BADI ME_PROCESS_PO_CUST. This cannot be used multiple times.
In this, we have methods (PROCESS_HEADER,PROCESS_ITEM).if we need to any validations for the fields we can write the logic here in this methods. In my case I need to check for the document type which I implemented in the method (PROCESS_HEADER).
Hope it helps you.
Thanks
Arbind

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<lw_extensionin>-structure     = 'BAPI_TE_MEREQITEM'.
* fill extension i-tab which mit ZZ-Felder EBAN
CALL METHOD cl_abap_container_utilities=>fill_container_c
        EXPORTING
          im_value               = lw_bapi_te_mereqitem
        IMPORTING
          ex_container           = <lw_extensionin>+30(930)
        EXCEPTIONS
          illegal_parameter_type = 1
          others                 = 2
IF sy-subrc <> 0.
    CASE sy-subrc.
      WHEN 1.
*          RAISE illegal_parameter_type.
      WHEN OTHERS.
*          RAISE unknown_error.
    ENDCASE..
ENDIF.
APPEND INITIAL LINE TO pt_extensionin
         ASSIGNING <lw_extensionin>.
CLEAR lw_bapi_te_mereqitemx.
lw_bapi_te_mereqitemx-preq_item = pw_output-bnfpo.
lw_bapi_te_mereqitemx-zz_qty = true.
lw_bapi_te_mereqitemx-zzdatum_grund = true.
lw_bapi_te_mereqitemx-zzuzeit_grund = true.
<lw_extensionin>-structure     = 'BAPI_TE_MEREQITEMX'.
* fill extension i-tabx
CALL METHOD cl_abap_container_utilities=>fill_container_c
        EXPORTING
          im_value               = lw_bapi_te_mereqitemx
        IMPORTING
          ex_container           = <lw_extensionin>+30(930)
        EXCEPTIONS
          illegal_parameter_type = 1
          others                 = 2
IF sy-subrc <> 0.
    CASE sy-subrc.
      WHEN 1.
*          RAISE illegal_parameter_type.
      WHEN OTHERS.
*          RAISE unknown_error.
    ENDCASE..
ENDIF.
It works for BAPI_PR_CHANFGE! It should work for BAPI_PR_CREATE.
(3)One condition is note 1176786, which correced errors in L2014I01 and L2105I01, where the code
   CHECK: <comp>-type_kind EQ lr_abap->typekind_packed ,
must be
   CHECK: <comp>-type_kind EQ lr_abap->typekind_packed OR "1176786
=> comma "," is wrong, logic operator "OR" is correct.
Viele Grüße
Shuhui

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