2497153 - HTTP 500 Error while accessing Integration Engine Message Monitor

When trying to access the Message Monitor under the Integration Engine in PI monitor an HTTP 500 error occurs.

In defaultTrace files the following error can be seen:

500 Internal Server Error is returned for HTTP request [http://<host>:<port>/mdt_soa/frames/util/jsp_error.jsp]:
component [MonitorServlet],
web module [mdt_soa],
application [sap.com/com.sap.xi.mdt.soa],
DC name [sap.com/com.sap.xi.mdt.soa],
CSN component[BC-XI-IS-WKB],
problem categorization [com.sap.ASJ.web.000137],
internal categorization [-1467315064].

[EXCEPTION]
com.sap.aii.utilxi.misc.api.UnexpectedException: Internal Error: An unexpected error occurred (com.sap.engine.boot.loader.SAPClassNotFoundException: com.sap.aii.mdt.server.integrationengine.IntegrationEngineFilter)

And

Exception thrown while creating Filter.
Thrown:
com.sap.aii.utilxi.misc.api.UnexpectedException: Internal Error: An unexpected error occurred (com.sap.engine.boot.loader.SAPClassNotFoundException: com.sap.aii.mdt.server.integrationengine.IntegrationEngineFilter)
at com.sap.aii.mdt.util.WebUtil.newFilter(WebUtil.java:925)

• SAP NetWeaver Process Integration
• SAP NetWeaver Process Orchestration

Process Integration 7.31, PI 7.31, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, AEX, monitoring, update, upgrade, 500, Internal Server error, pi monitor, rwb, pi mon, pi monitoring, PO, configuration and monitoring, filter, integration engine, message monitor (database), overview, HTTP 500, the website cannot display the page , KBA , BC-NWA-XPI , Process Integration (PI) Monitoring , Problem