[rules-users] Guvnor rule with a not and an ==

Hi, I have a rule where I want to check if an object doesn't exist or it exists and a field in it is null or a field in it is D. Here's .drl code that works rule "test does not exist is null or is D" when (not CLM_DET_LOAD_PendCode() || CLM_DET_LOAD_PendCode(pendCode_29== (null)) || CLM_DET_LOAD_PendCode(pendCode_29== "D") ) then System.out.println("CLM_DET_LOAD_PENDCOE does not exist, is null, or is D"); End Normally in Guvnor to do an Or, I choose "Any of the following are true..." from the 'Add a condition to the rule...' dialogue. But when I choose this and then try to do the "not" logic, there is no choice for 'not'. I can get the other two conditions in just fine. Short of putting freeform DRL language in there, do you have any suggestions? Am I missing an option in guvnor? Thanks Dean