Need to ALE only 2 fields through a reduced message type copied from MATMAS

Question

Hi,
Only the Authorization group fields MARA-BEGRU and MARC-QMATA need to be transferred through ALE from one system to another one.  A new reduced message type has been created from MATMAS.
The fields BEGRU and QMATA have been selected through the BD53 transaction to be part of the segments.
Result: 3 segments are part of the new Message type: E1MARAM and its 2 children E1MAKTM and E1MARCM.
Problem:  Even the BD53 (Reduced message type) transaction has been used, too many unnecessary fields are transferred through the ALE. 
The following fields in the E1MARAM segment must not been updated (transferred) in the receiving system:
          -  PSTAT,
          -  LVORM
          -  MTART
          -  MBRSH,
          -  MATKL,
          -  MEINS,
          -  GROES,
          -  WRKST,
          -  SPART,
          -  VPSTA.
They should disappear from the segment.
The E1MAKTM segment must not been transferred to the receiving system because the user does not want to modifiy the Material description.  But the BD53 (reduce message type) seems to consider that segment as mandatory.
Only few 1EMARCM segments with specific Plants (WERKS) should be sent on the receiving system.  Not all the Plants.  That segment should not include the PSTAT field.  I have no control on which Plants to transfer.
<u>Revision</u>:
Only 2 segments must be ALE'd with only the following fields:
          1-  <b>E1MARAM</b>:
                    a)  MATNR (Material number)
                    b)  BEGRU (Authorization group)
          2-  <b>E1MARCM:</b>
                    a)  WERKS (Plant)
                    b)  QMATA (Material Authorization Group for Activities in QM).
What should I do to ALE only those 2 segments and only those specific fields?
Thanks a lot.
Diane.

Answer 1

Thanks Ferry for the previous answer,
I have a problem with the E1MARCM segment.
My sending and receiving systems do not have always the same Plant numbers.
If a Plant exists on the sending system and it does not on the receiving system, the Plant must not be created on the receiving system. But from the sending system, I do not know which Plants the receiving system has. This is why the IDoc contains all the Plants. But I added some logic in the  <b>inbound</b> customer-function, EXIT_SAPLMV02_002, to ignore the Plants that do not exist on the receiving system in doing a SELECT on the MARC table in the receiving system.
But that customer-function is called from the IDOC_INPUT_MATMAS01 function module, in the " WHEN  E1MARCM " section:
          PERFORM CHECK_USER_EXIT TABLES T_EDIDD
                                                                        USER_SEGMENTS
                                                           USING CURRENT TABIX.
          LOOP AT USER_SEGMENTS.
                     CALL CUSTOMER-FUNCTION '002'
                               EXPORTING
                                            MESSAGE_TYPE    = IDOC_CONTRL-MESTYP
                                            F_CUST_SEGMENT = USER_SEGMENTS
          ENDLOOP.
In the perform check_user_exit, no record is created in the user_segments table because all the segments in my IDoc start with ' E1 ' :
          LOOP AT IDOC_DATA INTO USER_SEGMENTS FROM CURRENT_TABIX.
                    IF USER_SEGMENTS-SEGNAM(2) = ' E1 '.
                        EXIT.
                    ENDIF.
                    APPEND USER_SEGMENTS.
          ENDLOOP.
The customer-function is called within the ' loop at user_segments '. This is why the customer-function is never executed and my code is ignored. So, all the IDocs in the receiving system are in the status 51 (red light).
Do you have any idea how to resolve my problem.
Thanks.
Diane.