Want to show my own Error message after sending data through Input Schedule

Hi,

I want to show some Validation Messages.

I did the calculation in a Custome Logic BAdI.

To show the message I wrote :

Data : l_log TYPE String.

IF tot_percent > 1.

l_log = |'Warning : Total Percentage exceeds 100%'|.
cl_ujk_logger=>log( i_object = l_log ).

ENDIF.

Please suggest How to achieve this.

Thanks.