Hi,
You can just put following code on SAVE to trigger alert.
data: lv_alert_srv type ref to if_crm_ic_5x_ext_alert_srv.
lv_alert_srv ?= cl_crm_ic_5x_ext_alert_srv=>if_crm_ic_5x_ext_alert_srv~get_instance( ).
lv_alert_srv->trigger_alert(
iv_message = 'This is a test alert'
).
You don't event need to configure alert. This will appear in alert area.
Regards,
Naresh