How to use the message class CL_BSP_MESSAGES in the event handler?

Hiii,
I need to use the message class CL_BSP_MESSAGES in the even handler, because I need to use the Condition co_cancel_event_prefix to prevent saving in the method
global_messages->add_message(
                                        condition = co_cancel_event_prefix
                                        message   = TEXT-010
                                        severity = cl_bsp_messages=>co_severity_error ).
                                        dummy     = ME->COMPONENT_ID ).
Can anybody explain me how to use this method?
Kind Regards,
John

solved

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