How do you use this custom fact? An online dictionary defines "leiermål - sexual intercourse between people who is not married" (http://www.martinroe.com/eidhalist.htm). Do you set the date to nine months before the birth of the child? Is this fact/event even needed? That is, is it not equivalent to the child's birth parents having no Marriage fact? As they are the birth parents, we can reasonably conclude that they had sexual intercourse, even if it was indirect. Would deleting the fact or suppressing it from the GEDCOM output satisfy your friend's need?
Do you share the fact with the child? What would a parent's narrative sentence say? A child's?
Do built-in family facts (Census (family), residence (family)) also get interpreted as Marriage in Legacy?
The fact is used according to the tradition of the ministers. They set the date to the birth of the child, because the child was the proof that a Leiermål had taken place. My sentence shows as: X and Y had a child out of wedlock in 1779. The fact is not shared with the child.
You gave me an idea. The fact is not needed. I first record the parents without a Marriage fact, and afterwards with the fact Leiermål. I will see how it works when I delete the Leiermål fact.
I discovered this because I have been missing an important feature in RootsMagic, and that is an expansion of the narrative report - Ancestors with children. The report should be added an option to include all spouses and children. As mentioned, I work with genealogy for a whole parish, and that implies a lot of different trees. To get an overview I often make use of narrative reports of ancestors and is interested in a full picture like both of a man's marriages and the child his second wife got out of wedlock. The ancestor reports only give you blood lines. To solve the problem I earlier tried the program The Complete Genealogy Reporter by importing Gedcoms. I then discovered that Leiermål was turned into Marriage. Later the same happened in Legacy.
I haven't tested the other Family facts, because I don't use them. Instead I have an exstensive use of notes. For me that gives greater liberty to explain things.
The report I talk about have been on the Wish list several times. I still hope it will come because I like RM very much, because I feel it in many ways corresponds to my own way of thinking.