Prevent save with the DO_HANDLE_DATA methode

Question

Hiii,
I want to check some input values with the methode DO_HANDLE_DATA method. After pushing the save button, I check the input values and if the input values does not match certain criteria, I throw an error message with the following code:
          global_messages->add_message(
                                        condition = co_cancel_event_prefix
                                        message  = TEXT-010
                                        severity  = cl_bsp_messages=>co_severity_error ).
                                        dummy     = me->component_id ).
At the first time, It is possible to prevent save the input values but if I push the save button again, the input values are saved. The method DO_HANDLE_DATA is not invoked again.
I have not the possiblitiy to redefine an event like EH_ONSAVE, that will be invoked every time when pushing the save button.
Could anyone explain me, how to solve my problem? Should I use a different method instead of DO_HANDLE_DATA?
Kind Regards,
John

Answer 1

Hi Harris,
Although the DO_PREPARE_OUTPUT would be triggered, normally we dont code the before save logic there. Its recommended to put the logic in EH_OnSave or other such event handlers.
I am not aware of your exact scenario but  normally you can get an instance of your context node in Eh_OnSave  using the following template if the eventhandler is at the view controller impl class.
me->typed_context-><<Context Node>>->collection_wrapper->get_collection( )
Otherwise  if your context nodes are bound to custom controller,you can get to the typed context node via custom controller instance
lr_cuco  TYPE REF TO <<CustomController Impl class>>
lr_cuco ?= get_custom_controller( '<<Name of CuCo>>' ).
lr_entity ?= lr_cuco->typed_context-><<Your Context Node>>->collection_wrapper->get_current( ).
Hope this helps.
Regards,
Nisha