[rules-users] Many to many matching using Drools rules

Folks, I am recently working on a BI project which is doing reconciliation between repository and accounting. I'm using Drools 5.1.1 to maintain all these matching rules. One scenario I have no clue to implement in Drools is that I need to find x transactions from repository, to match y transactions from accounting, while existing repository transactions and accounting transactions are bigger than x and y. Does anybody have experience to do similar thing in Drools? Best Abe