[rules-users] Rules updating error

In my java ee application, I use drools 6.1.0.Beta1, deployed on jboss eap 6.2 (I have also deployed Kie Workbench 6.0.1.Final). In order to get the latest updates on my rules (made on kie wb) I tried to set kiescanner to "LATEST". This seems to not be working always (I'm not 100% sure about the reason, it seems to happen when I have not re-deployed the jar with the model classes I use in my rules, or I have not clicked on build&deploy of the rules project), so I have reverted to using "1.0" as the version and not changing the version when I update the rules project. There is an issue with the application not validating, because I have a guided decision table which uses a global variable and a function, but that seems to not be an error after all (everything seems to build as it should). However, while my application is running (and watching for updates through scanner), if I make an update and deploy the rules project again, the application retrieves the update and fails with a validation error about not being able to analyse the expressions regarding the global function and the global variable. Any suggestions? Thank you very much.