SAP MDG · REPLICATION OUTBOUND
How do I implement a configurable SAP MDG DRF filter using IF_DRF_FILTER with fallback and dynamic key extraction?
Implement the filter in IF_DRF_FILTER~APPLY_FILTER by reading main configuration for the replication object and business system, optionally enriching it with a context-specific rule set, and deleting rows from ET_FILTERED_OBJECTS when the resolved rule has SIGN = 'E'. If no configuration exists, keep the payload unchanged.
SOLUTION SUMMARY · SHORT ANSWER
Implement the filter in IF_DRF_FILTER~APPLY_FILTER by reading main configuration for the replication object and business system, optionally enriching it with a context-specific rule set, and deleting rows from ET_FILTERED_OBJECTS when the resolved rule has SIGN = 'E'. If no configuration exists, keep the payload unchanged.
Implement the filter in IF_DRF_FILTER~APPLY_FILTER as a configuration-driven exclusion step. First read the base rule set for the DRF replication object and business system; if none exists, keep all records. Then optionally resolve a context-specific group, merge specialized rules, and delete matching rows from ET_FILTERED_OBJECTS when the rule indicates exclusion.
Process flow
- Implement IF_DRF_FILTER~APPLY_FILTER in the filter class.
- Read the main configuration by IS_C_FOBJ and IV_BUSINESS_SYSTEM.
- Return immediately if no main rules exist.
- Optionally resolve a context-specific group such as account group or object type.
- Read specialized configuration for that group if available.
- Merge main and specialized rules into one effective rule set.
- Loop through ET_FILTERED_OBJECTS.
- Use ASSIGN COMPONENT 1 OF STRUCTURE <ls_object_row> to extract the business key dynamically.
CONFIGURATIONSource-backed paths
Maintain replication filter
Maintain runtime replication filter values used by the filter logic.
Referenced tables
| Object | Purpose |
|---|---|
ty_cfg | Internal configuration line type used in the sample filter class for rule lookup. |
tt_cfg | Internal table type of the sample configuration rules. |
ILLUSTRATIVE ABAP SAMPLE
Source ABAP example
Exact relevant implementation excerpt from the knowledge document.
1"==============================================================================
2" Generic Filter Code Sample
3" Purpose:
4" - Demonstrate a configurable filter implementation using the DRF pattern
5" - Show dynamic key extraction from generic structures
6" - Show fallback behavior when specialized context is unavailable
7"==============================================================================
8
9CLASS zcl_generic_filter_sample DEFINITION
10 PUBLIC
11 FINAL
12 CREATE PUBLIC.
13
14 PUBLIC SECTION.
15 INTERFACES if_drf_filter.
16
17 PROTECTED SECTION.
18 PRIVATE SECTION.
19
20 TYPES: BEGIN OF ty_cfg,
21 fobj TYPE char10,
22 business_system TYPE char60,
23 value TYPE char40,
24 sign TYPE c LENGTH 1,
25 END OF ty_cfg.
26
27 TYPES tt_cfg TYPE STANDARD TABLE OF ty_cfg WITH DEFAULT KEY.
28
29 METHODS get_main_config
30 IMPORTING
31 is_c_fobj TYPE drffobj
32 iv_business_system TYPE drf_system_alias
33 RETURNING
34 VALUE(rt_cfg) TYPE tt_cfg.
35
36 METHODS get_specific_config
37 IMPORTING
38 is_c_fobj TYPE drffobj
39 iv_business_system TYPE drf_system_alias
40 iv_object_group TYPE char20
41 RETURNING
42 VALUE(rt_cfg) TYPE tt_cfg.
43
44 METHODS resolve_object_group
45 IMPORTING
46 is_c_fobj TYPE drffobj
47 RETURNING
48 VALUE(rv_group) TYPE char20.
49
50 METHODS merge_effective_rules
51 IMPORTING
52 it_main TYPE tt_cfg
53 it_specific TYPE tt_cfg
54 RETURNING
55 VALUE(rt_effective) TYPE tt_cfg.
56ENDCLASS.
57
58CLASS zcl_generic_filter_sample IMPLEMENTATION.
59
60 METHOD if_drf_filter~apply_filter.
61 "------------------------------------------------------------
62 " 1) Read base configuration by object + business system
63 "------------------------------------------------------------
64 DATA(lt_main_cfg) = get_main_config(
65 is_c_fobj = is_c_fobj
66 iv_business_system = iv_business_system ).
67
68 " If no rules are configured, keep all objects as-is.
69 IF lt_main_cfg IS INITIAL.
70 RETURN.
71 ENDIF.
72
73 "------------------------------------------------------------
74 " 2) Resolve context-specific classification (optional)
75 "------------------------------------------------------------
76 DATA(lv_group) = resolve_object_group( is_c_fobj = is_c_fobj ).
77
78 "------------------------------------------------------------
79 " 3) Load specialized rules and merge with base rules
80 "------------------------------------------------------------
81 DATA(lt_specific_cfg) = VALUE tt_cfg( ).
82 IF lv_group IS NOT INITIAL.
83 lt_specific_cfg = get_specific_config(
84 is_c_fobj = is_c_fobj
85 iv_business_system = iv_business_system
86 iv_object_group = lv_group ).
87 ENDIF.
88
89 DATA(lt_effective_cfg) = merge_effective_rules(
90 it_main = lt_main_cfg
91 it_specific = lt_specific_cfg ).
92
93 "------------------------------------------------------------
94 " 4) Apply filter to outgoing object list
95 "------------------------------------------------------------
96 LOOP AT et_filtered_objects ASSIGNING FIELD-SYMBOL(<ls_object_row>).
97 DATA(lv_index) = sy-tabix.
98
99 " DRF payload is generic, so get business key dynamically from component 1.
100 ASSIGN COMPONENT 1 OF STRUCTURE <ls_object_row> TO FIELD-SYMBOL(<lv_object_key>).
101 IF <lv_object_key> IS NOT ASSIGNED.
102 CONTINUE.
103 ENDIF.
104
105 DATA(lv_key_value) = CONV char40( <lv_object_key> ).
106
107 READ TABLE lt_effective_cfg INTO DATA(ls_rule)
108 WITH KEY value = lv_key_value.
109 IF sy-subrc = 0 AND ls_rule-sign = 'E'.
110 " Exclusion rule found: remove object from replication list.
111 DELETE et_filtered_objects INDEX lv_index.
112 ENDIF.
113 ENDLOOP.
114
115 ENDMETHOD.
116
117 METHOD get_main_config.
118 " Replace this SELECT with your productive configuration table.
119 " Example pattern:
120 " SELECT * FROM zmdg_drf_config INTO TABLE @rt_cfgThe remaining configuration, implementation details, and testing guidance continue from this answer more…
Related questions and keywords
Alternative questions
- How do I build a DRF filter class for MDG outbound replication?
- How do I exclude objects in DRF based on configuration and context?
- How do I implement IF_DRF_FILTER~APPLY_FILTER for a generic MDG replication filter?
Possible questions
- Which class pattern should I follow for a configurable DRF filter?
- How does the filter read main and specialized rules?
- How do I extract the business key from generic DRF payload rows?
- What is the fallback behavior when no special context is available?
- Which transactions are typically used when building and testing this filter?