To reproduce the problem you need to do the following steps: 1 - Create a Guided Rule 2 - Open the project editor, then the project general settings 3 - Add two External Data Objects (java.util.List and java.lang.String) 4 - Open back the previous created guided rule 5 - Add a Freeform DRL field 6 - To the freeform field, add the following content: $myList : List( empty == false ) forall( String( this.startsWith( "n" ) ) from $myList ) 7 - There is not necessary to add something in the then clause, if you want you can add for example a simple system out. 8 - Open Data Object tab from your guided rule to add the two imports (List and String) from the drop down list. 9 - Save the rule 10 - Look at the source code and you will see the "forall" keyword as expected. 11 - Now, close the guided rule window and re-open it. You will see that the keyword "forall" from source code has changed to "exists", that has the opposite meaning.