I found a problem that I'm not sure as to whether the problem is a bug with the Spring-IDE or a 1.0/1.1 incompatibility problem.
I declare an AbstractService node as an interceptor with the intent of deriving concrete nodes from it. I can't remember exactly how it went but it was along the lines of the following:
<beans>
<bean id="dataSource" classname="...JndiFactory">
...
</bean>
<bean id="transactionManager" ...>
</bean>
<bean id="abstractService" abstract="true" classname="...Proxy">
<property name="transactionManager">
<bean refid="transactionManager"/>
</property>
<property name="methods">
<properties>
<prop name="load*">etc...</prop>
...regex for methods to be intercepted defined here...
</properties>
</property/>
</bean>
<bean id="productService" parent="abstractService">
<property name="target">
<bean classname="...ProductServiceImpl">
<property name="dataSource">
<bean refid="dataSource"/>
</property>
</bean>
</property>
</bean>
</beans>
By no means correct, but you get the idea.
Anyway, the Spring-IDE was giving a marker that "abstract must be declared" for the abstractService node. Well, as you can see, it had been declared, so it was a false error.
Re-arranging the declaration to eliminate the abstract node was the only way that I could get the marker to go away.