[rules-users] For loop inside a modify block problem

Hello, guys, I have the following snippet of a right side rule: modify ($gsc) { doSomething($item.id); for (int i = 0; i < $item.quantity; i++) { doSomethingElse($item.id); } } which looks like is invalid syntax in some way, but it comes out with strange error report, such as '[Error: no such identifier: $item]' Would you please assist me on how to put that loop inside that modify block? Thank you and regards, Martin