Message from I_STEP=3 not showing up in prompt

Hi all,

I am doing a variable validation in BW in variable customer exit ( EXIT_SAPLRRS0_001 ) in I_STEP = 3. Here is the coding:

IF i_step = 3.   READ TABLE i_t_var_range INTO loc_var_range     WITH KEY vnam = 'C_KNRVB1_C_VMIND_CMCO001'.   IF sy-subrc = 0.     IF loc_var_range-low = '10344689'.              CALL FUNCTION 'RRMS_MESSAGE_HANDLING'         EXPORTING           I_CLASS  = 'BRAIN'           I_TYPE   = 'W'           I_NUMBER = '017'           "I_MSGV1  = 'KV/KA und VH dürfen nicht beide leer sein!'           .       RAISE dummy.     ENDIF.   ENDIF.
ENDIF

I am just using the message class BRAIN with message number 017 for test purposes.

In RSRT i can see the message being displayed, when I enter "10344689" as the variable value and hit "Execute" (or "Check").

In Design Studio application it just disables the "OK" button on initial variable screen (prompt screen) but does not show the message.

I already tried different message types (e. g. I, E) but with no success. The setting "Displayed Message Types" in the application is "All".

We are on BO BI 4.0 SP09 and Design Studio 1.3 SP1 with SAP BW 7.31 SP10.

Any ideas, why the message is not displayed in the initial prompt?

Regards,

Philipp Hinnah