Approve Travel Expense Fiori Gateway Extension

Extending Approve Travel Expense (ATE) Fiori Gateway using SE80 approach:

I see most of the blogs explaining about the SEGW Gateway Extensibility as this is/will be used for all Fiori Gateway extensions. To redefine older approach (SE80) Fiori apps below will be helpful.

-> Earlier before Gateway Service Builder(SEGW) was introduced SAP has built Fiori apps with older methodology that is SE80( Repository browser) approach

-> Here, we will discuss the below

                         

                 1)  Add additional fields to structure

                 2)  Create BADI to extend MPC( Model Provider Class ) and DPC( Data Provider Class ) class

                 3)  Execute the standard OData service with additional fields

Requirement: Add additional custom fields in Approve Travel Expense Fiori app in Information tab as shown below

Step 1:

• Go To Transaction SE80( Repository Browser )
• Open Package P_SRA008

Step 2:

• We need to check to which structure we need to add the additional fields so that it will be added to same OData service call which is getting called to fetch the information details in Fiori ATE app
• You can check the structures which are mapped to Entity as below

P_SRA008->Subpackages->P_SRA008_ODATA->Class Library->CL_SRA008_MGW_MED_TEA->Methods->BUILD_META_DATA

Step 3:

• Now we know which structure to be enhanced to add the additional fields in the information tab
• For every standard structure “SRA008_S_TEA_WORKLIST” there will be an include structure “SRA008_S_TEA_WORKLIST_INCL”.
• We need to add our additional fields in include structure “SRA008_S_TEA_WORKLIST_INCL” using Append structure. Create Append Structure and add your additional fields ( This am not explaining here as it is discussed in many other blogs )

Step 4:

• We added custom additional fields to the structure and to consume these additional fields in the UI we need to expose these fields to OData Service
• For that, we need to enhance the method “CHANGE_META_DATA” by implementing the BADI.
• Create the Enhancement Implementation “Z_EI_FIELD_EXT”(any custom name) in the Enhancement Spot “SRA008_APPROVE_TRAVEL_EXPENSE”
• All below names which starts with ‘Z’ can be any name.

Enhancement Spot	SRA008_APPROVE_TRAVEL_EXPENSE
Standard BADI	SRA008_BADI_APV_TRAVEL_EXP
Enhancement Implementation	Z_EI_FIELD_EXT
BADI Implementation	Z_BADI_FIELD_EXTENSIBILITY
Interface	IF_SRA008_BADI_APV_TRAVEL_EXP
Implementing Class	ZCL_BADI_ATE_FIELD_EXT
Method Implemented	CHANGE_META_DATA

• This redefined method “CHANGE_META_DATA” will get executed after the standard method “BUILD_META_DATA”.

Sample piece of code in the method CHANGE_META_DATA for adding additional field:

******************************************************************************************************************

DATA:

ls_entity                  TYPE cl_sra008_mgw_med_tea=>ys_entity,
ls_property              TYPE cl_sra008_mgw_med_tea=>ys_property,
lv_order                   TYPE i,
io_property              TYPE REF TO /iwbep/if_mgw_odata_property,
io_entity_type          TYPE REF TO /iwbep/if_mgw_odata_entity_typ,*** Worklist CollectionCLEAR ls_property.CLEAR lv_order.ADD 240 TO lv_order.
ls_property–entity_type           = ‘Worklist’.
ls_property–property_name     = ‘zzpdm_pm’.
ls_property–abap_name          = ‘ZZPDM_PM’.
ls_property–is_key                 = abap_false.
ls_property–is_nullable           = abap_false.
ls_property–is_title                 = abap_true.
ls_property–keep_in_content   = abap_true.
ls_property–is_creatable         = abap_false.
ls_property–is_updatable        = abap_false.
ls_property–is_filterable          = abap_false.
ls_property–visible_in_list       = ‘false’.
ls_property–visible_in_detail    = ‘false’.
ls_property–display_order       = lv_order.
ls_property–semantic             = ”.
ls_property–currency_for_amount = ‘zzpdm_pm_curr’. “Currency reference field

INSERT ls_property INTO TABLE it_property.

LOOP AT it_entity INTO ls_entity.

IF ls_entity–entity_type = ‘Worklist’. “Name of the entity
          io_entity_type    = it_model->get_entity_type( ‘Worklist’ ).
          io_property        = io_entity_type->create_property                                                                                                                                                                                                                          ( iv_property_name  = ‘zzpdm_pm’
                                                                      iv_abap_fieldname = ‘ZZPDM_PM’ ).   

  io_property->set_nullable( abap_true ).

  ENDIF.

ENDLOOP.

****************************************************************************************************************

Find the attached document for sample piece of code for multiple fields.

Step 5:

Also redefine the method “CHANGE_LAST_MODIFIED”( always make sure that this is future date) to pick the last modified timestamp fields.

Step 6:

Clear your cache  

Transactions:   /IWBEP/CACHE_CLEANUP                     

                       /IWFND/CACHE_CLEANUP

Step 7:

Now, execute the OData service and see whether all your custom fields are added to the service, Please see whether you are executing the correct OData service 

/sap/opu/odata/sap/SRA008_SRV/WorklistCollection?$skip=0&$top=20&$inlinecount=allpages

Step 8:

Now we can add our custom logic in our respective BADI methods to populate data

Note: This approach will also be help full for Fiori Gateway Extension for apps like

• Track Shopping Cart
• Approve Shopping Cart etc…

Your comments will be helpful to improve the doc steps.

We are done! Thanks and cheers.