We all find occassions where we link one app to another only to find it's the second link. Then eventually we discover we've made a mess with redundant links and we must manually analyze which links are in use. So, given it's rare to purposely have two links or more, it'd be nice if SS told us "You already have a link called 'abc' between those apps. Continue/Cancel." This message would prevent a lot of confusion. So this request is to request a warning message.