Hi @HendricksKl ,
if I am understanding correctly, it should be referring domain report indeed. It should be report with Landing page URL broken down with Referrer domains and filtered to contain top-x.nl.
Also, You must configure your report suite’s Internal URL filters to use this dimension. Failure to configure internal URL filters can either include internal domains or prevent external domains from appearing.
Do you track all websites under one report suite? If so, do you have previous page URL dimension implemented? That report can help if any setting is amiss.
Best,
Isha