Triggering an Error Message leads to Warning Message in RAP BTP

[sebastian_wilhelm1]

Hi Experts,

I'm trying to to display an error message in my Fiori App, but instead a warning message is displayed with the option to continue processing.

Creating the Message 

APPEND VALUE #( %tky = run-%tky ) TO failed-run.
APPEND VALUE #( %tky = run-%tky
                %msg = new_message( id       = 'ZM_RUN'
                                    number   = 001
                                    severity = if_abap_behv_message=>severity-error ) TO reported-run.

 A Warning is displayed

Does anyone of you, know why this happends and how to solve this issue?

Note: The process is started via a Button "transform Product" on an Object Page in display mode.

Thanks and regards, Sebastian