[rules-users] How to write rules that can skip checking some constraint (i.e. "or" inside the rule)

Hello List, I'm trying to express a list of channels the subscriber is allowed to access, this splits into 2 possible flows : 1. Subscriber has X>0 in $enabledChannels, allow passing only for these channels. 2. Subscriber has "null" in the $enabledChannels - In that case continue because this check is not required. I'm trying to express this in the constraint node in like this, which does not work $subscriber : DynaSubscriber( adsEnabled == true, $optoutStr : optoutStr, enabledChannels contains $channelId // Make sure subscriber is "service registered" for this channel. /*PROBLEM::::*/ or enabledChannels == null ) I would like to be able to say, If enabledChannels is marked (In any way you would suggest) as "empty" don't check this constraint node. How can I do this? I'm using Drools3, but if feasible solution is presented in the form of Drools4, 5 please kindly let me know this information. Thank you, Maxim. -- Cheers, Maxim Veksler "Free as in Freedom" - Do u GNU ?