Command map with subrc = 4

Question

Dear Experts,
I'm currently facing a problem where I'm adding a Mapping List into an internal table.
Then the mapping will be executed dynamically based on the list.
The problem is that there are some fields where it isn't working.
May some can explain me more about the command "map" how it works.
Badi
include: LMEGUICJM
Class  lcl_req_item_table - Method  read_from_catalog
Line: 4954
TRY.
               CALL FUNCTION 'ME_MAP_CHAR_TO_PACK'
                 EXPORTING
                   im_pack = <target>
                 CHANGING
                   ch_char = <source>
                 EXCEPTIONS
                   OTHERS  = 1.
               map <s_target> ls_map_fields-item_field <source>.
-----------> if I use my own fields field it fails with subrc 4
             CATCH cx_sy_conversion_error cx_sy_arithmetic_error.
*                 Fehler bei Datenübernahme von &1 aus dem Katalog
*                 in das Feld &2
               MESSAGE i765(me)
                 WITH <source> ls_map_fields-item_field.
               l_map_error = mmpur_yes.
           ENDTRY.
In Badi: IF_EX_CATALOG_CUST~MAP_CATALOG_VALUES
       clear ls_fields_map.
       ls_fields_map-catalog_field = 'CUST_FIELD5'.
       ls_fields_map-item_field = 'PROCESS'.
       append ls_fields_map to ct_field_map.
PROCESS is available in EBAN user exit include CI_EBANDB.

Answer 1

Hi
map <s_target> ls_map_fields-item_field <source>
MAP is a macro:.
DEFINE map.
*     &1 - destination structure
*     &2 - destination field
*     &3 - source value
       is_input_allowed &2.
       if sy-subrc is initial.
         assign component &2 of structure &1 to <target>.
         if sy-subrc is initial.
           <target> = &3.
         endif.
       endif.
     END-OF-DEFINITION.
As you can see It move te value by field-symbols, the problem should be in IS_INPUT_ALLOWED, it's another macro:
DEFINE is_input_allowed.
*     &1 - destination field
*     lt_fs - lokal table fieldselection (metafield - fieldstatus)
*     my_cat_mapping - table fieldmapping (fieldname - metafield)
       read table my_cat_mapping into l_map
                                 with key fieldname = &1.
       if sy-subrc is initial.
         read table my_cat_fs into ls_fs
                              with key metafield = l_map-metafield.
         if sy-subrc is initial.
           if not ( ls_fs-fieldstatus eq '+' or
                    ls_fs-fieldstatus eq '.' or
                    ls_fs-fieldstatus is initial ).
             sy-subrc = 1.
           endif.
         endif.
       endif.
     END-OF-DEFINITION.
If it's returns a SY-SUBRC = 4, it means:
- or your field is not loaded in internal table MY_CAT_MAPPING
- or your field is not loaded in intenal table  MY_CAT_FS
So you should check why your fields is not in those table
Max