SAP MDG · VALIDATION DERIVATION
How do I implement SAP MDG validation in IF_EX_USMD_RULE_SERVICE~CHECK_CREQUEST?
Implement the BAdI in SE18/SE19, assign an implementing class, and place the business validation in the relevant interface method. For entity-level validations, SAP MDG uses ET_MESSAGE; however, the retrieved source for CHECK_CREQUEST is an empty compatibility hook, so the practical implementation pattern is to keep CHECK_CREQUEST empty unless you have a specific CR-level rule to add, and otherwise use CHECK_ENTITY for record-level checks.
Implement the BAdI in SE18/SE19, assign an implementing class, and place the business validation in the relevant interface method. For entity-level validations, SAP MDG uses ET_MESSAGE; however, the retrieved source for CHECK_CREQUEST is an empty compatibility hook, so the practical implementation pattern is to keep CHECK_CREQUEST empty unless you have a specific CR-level rule to add, and otherwise use CHECK_ENTITY for record-level checks.
Implement the BAdI in SE18/SE19, assign a class that implements `IF_EX_USMD_RULE_SERVICE`, and decide whether the rule belongs to `CHECK_CREQUEST` or `CHECK_ENTITY`. In the retrieved example, `CHECK_CREQUEST` is intentionally left empty as a compatibility hook, so the actual business validation pattern is to use entity-level checks with `ET_MESSAGE` when you need record-specific errors or warnings.
Process flow
- Open transaction
SE18and display the BAdI definition, for exampleUSMD_RULE_SERVICE. - Open transaction
SE19and create the BAdI implementation. - Assign or create the implementing class and implement IF_EX_USMD_RULE_SERVICE.
- Implement CHECK_ENTITY for record-level validation and keep CHECK_CREQUEST empty unless you need a true CR-level rule.
- Build validation messages in
USMD_S_MESSAGEand append them to ET_MESSAGE. - Activate the class, then the BAdI implementation, then dependent objects.
- Trigger the MDG scenario and debug the method call to confirm the hook is executed.
Referenced tables
| Object | Purpose |
|---|---|
usmd_s_message | Message structure used to return validation messages to the MDG framework. |
ILLUSTRATIVE ABAP SAMPLE
Source ABAP implementation example
Concrete CHECK_ENTITY implementation pattern from the same knowledge document set.
1METHOD if_ex_usmd_rule_service~check_entity.
2 DATA: lo_app_context TYPE REF TO if_usmd_app_context,
3 lt_message TYPE usmd_t_message,
4 ls_message TYPE usmd_s_message,
5 lv_crtype TYPE usmd_crequest_type,
6 lv_crstep TYPE usmd_crequest_appstep,
7 lv_crid TYPE usmd_crequest.
8
9 FIELD-SYMBOLS: <ls_data> TYPE any,
10 <lv_value> TYPE any.
11
12 lo_app_context = cl_usmd_app_context=>get_context( ).
13 CHECK lo_app_context IS BOUND.
14 CHECK io_model->d_usmd_model = 'BP'.
15
16 lo_app_context->get_attributes(
17 IMPORTING
18 ev_crequest_type = lv_crtype
19 ev_crequest_step = lv_crstep
20 ev_crequest_id = lv_crid ).
21
22 CHECK it_data IS NOT INITIAL.
23
24 LOOP AT it_data ASSIGNING <ls_data>.
25 ASSIGN COMPONENT 'SOME_MAND_FIELD' OF STRUCTURE <ls_data> TO <lv_value>.
26 IF <lv_value> IS ASSIGNED AND <lv_value> IS INITIAL.
27 CLEAR ls_message.
28 ls_message-msgid = 'ZMDG_SUPPL'.
29 ls_message-msgno = '001'.
30 ls_message-msgty = 'E'.
31 ls_message-fieldname = 'SOME_MAND_FIELD'.
32 APPEND ls_message TO et_message.
33 ENDIF.
34 ENDLOOP.
35
36 IF et_message IS NOT INITIAL.
37 zcl_mdgbp_bp_validation=>adjust_messages(
38 EXPORTING
39 cr_number = lv_crid
40 CHANGING
41 ct_message = et_message ).
42 ENDIF.
43ENDMETHOD.The remaining configuration, implementation details, and testing guidance continue from this answer more…
Related questions and keywords
Alternative questions
- How do I activate and implement a BAdI validation in SAP MDG?
- How do I create a CHECK_CREQUEST implementation for
USMD_RULE_SERVICE? - How do I write ABAP logic for SAP MDG rule-service validations?
Possible questions
- How do I implement SAP MDG validation in IF_EX_USMD_RULE_SERVICE~CHECK_CREQUEST?
- How do I create a BAdI implementation for
USMD_RULE_SERVICEin SE18/SE19? - How do I add custom validation logic and messages in SAP MDG?
- How do I debug whether a
USMD_RULE_SERVICEBAdI method is being called? - What is the difference between CHECK_CREQUEST and CHECK_ENTITY in SAP MDG?