Hi! If I write rules in a decision table I can leave cells empty if I don't need to use all of the conditions in a row. How can I do this with the ExternalSpreadsheetCompiler? I would need something like: rule "rule_(a){row.rowNumber}" when $s : MyType1() @ifDefined{field1} $e : MyType2(val1 == "@{field1}") from $s.SUB; @ifDefined{field2} $e : MyType2(val2 == "@{field2}") from $s.SUB; then retract($s); end Thanks Juergen -- View this message in context: http://n3.nabble.com/Rule-Templates-with-empty-cells-tp138571p138571.html Sent from the Drools - User mailing list archive at Nabble.com.