can't create no more Request filter!!!

Hi,

we user SDP 7.5.0 Build 7504 and it seems, that it's not possible to create any request filters:

==================================================
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException:

Invalid Table alias subcatadef specified
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:90)
com.adventnet.authentication.ContextChangeDetector.doFilter(ContextChangeDetector.java:112)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)

root cause

java.lang.IllegalArgumentException:

Invalid Table alias subcatadef specified
com.adventnet.ds.query.util.QueryUtil.getTable(QueryUtil.java:873)

==================================================

Am I alone?

Regards,
Stephan