I've just been trying to make an internet checkin (YTO-AMS) after changing my flight date.
The date change fees have been paid, at a KLM counter.
The system will not accept the check in details, a colleague had the same problem a few weeks ago, is there any way around this or am I stuck with it.

I wanted to re asign my seat as at present I am in the depths of the back of the plane, called the "help" desk already but they were no help either saying there was nothing available, but if I check the saet plan on NWA.com there appears to be several seats up front still available, or are these maps not accurate?