Offset lines model notification

Hi everybody,
I wonder how to operate on offset lines that, for varied reasons, have missed their own references and so one have the model notification with the yellow triangle.

You can't do an Edit References or a Edit Edefinition.
Furthermore, if you want to delete the problematic lines to remake them, you don't see them anymore (are blanked or something like that) and don't see where were the start and the end.

Thanks
Bye