Regarding Change document read

Question

Hi All,
Am using Change Document read function module to find out the changed material details. i want to fetch the plant from marc to filter the records am having the only relationship i.e material to fetch the details from marc and mara,with this i can't filter because for one material four plants will be there.so am using the tabkey from that function module to fetch the plant i don't think is this a right way can anyone explain how i can get a plant.

Answer 1

Think you query is misleading...
As per my understanding you are trying to find all changes for materials in a specific plant right????
If so below code can give you some idea:
TABLES: mara.
SELECT-OPTIONS: so_date FOR mara-laeda. " Date Criteria
PARAMETERS: p_werks TYPE werks_d obligatory. " Plant
CONSTANTS: c_tcode TYPE sytcode VALUE 'MM02'.
TYPES: BEGIN OF ty_marc,
         matnr TYPE matnr,
         werks TYPE werks_d,
       END OF ty_marc.
DATA: i_cdocs TYPE STANDARD TABLE OF cdred,  " Change Docs
      wa_cdocs TYPE cdred,
      i_marc TYPE STANDARD TABLE OF ty_marc, " Plant Existence
      wa_marc TYPE ty_marc.
START-OF-SELECTION.
" Read Change documents
  CALL FUNCTION 'CHANGEDOCUMENT_READ'
    EXPORTING
      date_of_change             = so_date-low
      objectclass                = 'MATERIAL'
      date_until                 = so_date-high
    TABLES
      editpos                    = i_cdocs
    EXCEPTIONS
      no_position_found          = 1
      wrong_access_to_archive    = 2
      time_zone_conversion_error = 3
      OTHERS                     = 4.
" Delete documents where materials are not changed
  DELETE i_cdocs WHERE tcode NE c_tcode.
  CHECK NOT i_cdocs[] IS INITIAL.
* Check for Material existence in Plant
  SELECT matnr werks INTO TABLE i_marc
         FROM marc
         FOR ALL ENTRIES IN i_cdocs
         WHERE matnr = i_cdocs-objectid(18)
         AND   werks = p_werks.
  LOOP AT i_cdocs INTO wa_cdocs.
    READ TABLE i_marc INTO wa_marc
       WITH KEY matnr = wa_cdocs-objectid.
    IF sy-subrc EQ 0.  " Material Defined in specified plant
      " Further Processing statements
    ENDIF.
  ENDLOOP.
Correct me if my understanding is wrong.
Regards
Eswar