Ok, since you are using connected lists, listen to the receive event and when it occurs, validate if there's another item in the target. If there is, you can either remove the old one or the new one.
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?
AleMonteiro 238 Can I pick my title?