How to initiate a Deletion of a main Entity in MDG-X

Hello,

We have a Custom MDG Data Model with an access class that does all our actions (Save, Read, Query, Enqueue, Dequeue, Authority Check, Derivations, etc...)

We are trying to also enable the Deletion of a record for our main entity. The reuse area is a Z-table in our case and the requirement is not to flag for deletion, but to delete the entry.

Can you provide information on what triggers the population of the structure lr_data_del in the SAP standard read_data method.

CALL METHOD io_delta->read_data
       EXPORTING
         i_entity      = <lv_entity>
         i_struct      = if_uiss_constant~gc_check
       IMPORTING
         er_t_data_ins = lr_data_ins
         er_t_data_upd = lr_data_upd
         er_t_data_del = lr_data_del.

The way we initiate the process is by setting up a separate button on the search BADI implementation in the method IF_EX_USMD_SEARCH~PROCESS_EVENT and setting up the activity to DELETE, but apparently that's not sufficient

WHEN 'DELETE'.
        es_navigation-application = if_mdg_bp_constants=>gc_app_single_maintenance.
        ls_navigation-fieldname   = if_mdg_bp_constants=>gc_ptag_process.
        ls_navigation-value       = 'ZIDL'.    "Delete Entity business activity
        APPEND ls_navigation TO es_navigation-t_parameter.
        ls_navigation-fieldname   = if_mdg_bp_constants=>gc_ptag_editing_mode.
        ls_navigation-value       = if_mdg_bp_constants=>gc_activity-delete.
        APPEND ls_navigation TO es_navigation-t_parameter.

The Process is triggered properly, but when debugging the access class, all three structures remain empty lr_data_ins, lr_data_upd and also lr_data_del.

Please advise on the proper way to implement a deletion functionality if you've done this in the past.

Thanks in advance,

Boris