SLA Notifications on OTRS 2.3.4 not working

Hi, I am evaluating OTRS 2.3.4 for my organization, I do not have ITSM I have configured Services and associated SLAs with them. I have also associated Customers with Services but still can't get the OTRS system to generate notifications on SLAs being breached. Could I be going wrong somewhere? I get notifications on creation, closure etc. Any help would be appreciated. Thanks & Regards, Sunjay </PRE><p style="font-family:arial;color:grey" style="font-size:13px">This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message.</p><PRE>
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Kaul, Sunjay