[rules-users] RuleFlow Groups and retraction

Hi, one question about using ruleflows: 1. i have a ruleflow consisting of 2 Nodes 2. i insert 2 facts 3. the 2 facts match the condition in rule for the second node, so when inserting an activation is generated 4. but the rule in the first node will retract one of the 2 facts 5. it seems the activation for the second node is not cancelled also i do a retract in the rule 6. now the activation in second node tries to execute and results in a NullpointerException What do i do wrong? Cheers Markus