I have been adding lots of data from the civil marriage records that recently became available for my ancestral town. In a few cases, the lines cross into what I traced of my own ancestors. As I go further back, any new connection means more avalanches of cousins-by-the-dozens. However, it had to happen: Rosario Cantalupo married Rosaria Gigliello in 1873. In 1892, another Rosario Cantalupo married a different Rosaria Gigliello. I put messages in the NOTE sections of each, but there needs to be a way to warn the user not to merge these people.
Of course, if I enter a marriage record with the parents names, and then the next year the bride's sister gets married, I will have duplicate persons for the father and mother, and these need to be merged, but the merger screen does not allow for showing warning notes; and putting WARNING in a name field, such as a title or suffix, is ugly.