hi all I've to following error when using one of my drl Can't i use more than one param in the function call ? thanks JLL javax.ejb.EJBTransactionRolledbackException: org.drools.rule.InvalidRulePackage: Function Compilation error Rule Compilation error The method getMin(PrestationFacturable, PrestationFacturable) in the type GetMin is not applicable for the arguments (PrestationFacturable, FactHandle) the drl file is the folowing package be.labocollard.server.rules ; import be.labocollard.server.entities.PrestationFacturable; import be.labocollard.server.entities.Prestation; function PrestationFacturable getMin(PrestationFacturable pf1, PrestationFacturable pf2) { if (pf1.getPrestation().getNombreB() > pf2.getPrestation().getNombreB()) return pf1; else return pf2; } rule "cumul_1" when $pf1 : PrestationFacturable( $p1 : prestation -> ($p1.getCodePrestation().equals("120153") || $p1.getCodePrestation().equals("120175") || $p1.getCodePrestation().equals("120190"))) $pf2 : PrestationFacturable( $p2 : prestation -> ($p2.getCodePrestation().equals("120050") || $p2.getCodePrestation().equals("120514"))) then retract(getMin($pf1, $pf2)); end -- View this message in context: http://www.nabble.com/function-compilation-error-tf3589880.html#a10032557 Sent from the drools - user mailing list archive at Nabble.com.