Thanks for your reply.
I ended up digging in jar-ops and calculating examples.
I came up with this.
For a wet runway you should use, dry distance(with 60% margin) * 1,15.
For a contaminated runway, you should use the longest value of two:
Either the one above dry * 1,15 (wich includes the 60% margin)
Or
If your AFM contains values for contaminated runways,
The value from the book for the selected contaminanr * 1,15
In this case, there is notes in jar-ops saying that you should NOT include
the 60% margin.
The only doubt I have now, is that the later pharagraph say contaminated runways. A wet runway is not a contaminated runway, but my AFM still contains data for wet runways in this section. Can I use this, even thou a wet runway is not considered contaminated accordning to jar-ops