Hi Rajesh,
Please be sure that your alert profile is created just for desired location/SKUs. Then in the DS planning board, press Profiles button. From popup choose More Profile tab and check if your profile is in the Alert Profile file.
In the Work Area section of DS board you have to enter the three SKUs and the work center assigned to them and then Execute.
Normally when you will trigger the Alert in the DS planning board you will have alerts just for your selection (SKU/work center).
Hope that this can help you!
Thanks.
Regards, Marius