ABAP_to_the_Future

8
Business Object Processing Framework (BOPF)
The method you do want to redefine is GET_EXTERNAL_IDS. The default behavior of
the BOPF change documents is to keep track of object changes by using the GUID.
Because this number will not mean anything to anybody, you have to add in a humanfriendly
reference number as well (in this case, the monster number) so that you
can work out what monsters have actually been changed. The code for redefining
this method to handle your monster object is shown in Listing 8.23. This method
gets called because you added structure /BOFU/CDTCEXTID to your monster object
in Transaction SCDO. Code in the standard SAP class looks to see if that structure
has been added, and if it has, then the GET_EXTERNAL_IDS method is called.
In the code in Listing 8.23, first the inco ming node is queried to make sure the
object being changed is the monster header. If so, then a loop is performed of all
header records being changed (usually on ly one), and the external ID (monster
number in this case) is extracted from the header record and exported into table
ET_EXTERNAL_IDS.
METHOD /bofu/if_cdo_creation~get_external_ids.
* Local Variables
DATA: ls_ext_id LIKE LINE OF et_external_ids,
ls_monster_node TYPE zsc_monster_header.
CASE iv_node_key.
WHEN zif_monster_c=>sc_node-monster_header.
LOOP AT it_node_data INTO ls_monster_node.
ls_ext_id-key = ls_monster_node-key.
ls_ext_id-ext_id = ls_monster_node-monster_number.
INSERT ls_ext_id INTO TABLE et_external_ids.
ENDLOOP.
WHEN OTHERS.
RETURN.
ENDCASE.
ENDMETHOD.
Listing 8.23 Redefining a Standard BOPF Change Document Method
Later, you’ll see that the redefined meth od shown in Listing 8.23 adds an extra
entry into the change document database tables to store the external ID (monster
number) and link it to the GUID of the business object.
Linking all the Change Document Components Together in the IMG
Finally, you’ll need to link up all the jigsaw pieces you’ve created relating to
change documents and put them all together in a configuration table. Go into the
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