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E.g. you can enter two line breakpoints with the same classname, line number and other attributes. (Originally reported in bug #12443 as "another buggy behaviour".)
There is no reason why we should avoid such situations. If the user is trying to create two breakpoints on the same place he/she probably knows what he/she is doing. For exaple he/she can have more breakpoints on the same line but with the different conditions and print texts.