Thank you for the suggestion. We will consider this as the last way to solve the problem.
Does anyone know if it's possible to get arund this problem by republish the service via ArcGisServer?
I mean, make a mxd, add the WMS as a layer, publish it on ArcGisServer.
If anyone from ESRI is following this:
I am working for a Swedish agency.
A number of Swedish agencies and authorities have an agreement of geodata exchange, in accordance with the EC-directive, Inspire. OGC standards, I belive, is a key strategy.
So I think this issue will soon be wery important.