[rules-users] Unable to access setter fields of fact in RHS using guided rule editor

Using Drools 4-0-4, I am trying to setup a very simple prototype system to use either of the Guided Rule Editors in Eclipse or BRMS. I have created a simple bean class to act as my Fact, and can see this when setting up the LHS, e.g. I can create a condition that a field in my fact must equal "X". I then want to set a different field to a new value as the RHS, but in the "Then" section of the guided rule editor, when I try to choose a value from the drop down list option "set the values of a field on", I do not see my fact, hence I can't access it to set the value I want. I get the same behaviour using both Eclipse and BRMS guided rule editors, e.g. my Fact bean is accessible in the LHS but not the RHS? I've read and re-read the user guides and documentation, and tried using the supplied example Drools projects as the basis of some guided rules, but I always get the same result. Any suggestions much appreciated.