Customer uses Service desk 4.5, and custom developed web application, that runs on IIS. Users claim their service calls through web interface, written in ASP.NET. Service desk has custom field for description of the call, text with 4000 characters.
However, after upgrading to SP 17, the service call, that has message length over specific lenght (don't know long it is right now) and is claimed through web interface, is not recorded in Service desk. Before upgrade, it was working properly.
Nothing has been done on web application itself, so I guess something has changed in Service desk.
Re: Service desk custom fileds problem after SP 17
Since it is not very clear what the problem is i would advice to try and open a new service call with the same template as you use in the import mapping and manualy insert the data you use in the sd_event action. Try to save it and see if you are not missing a mandatory field.
If this test works out fine you know for sure that you import correct data and have all mandatory fields coverd.
It is possible that the template or the import mapping got corrupted during the upgrade. So you could also try to create a new template and a new import mapping and try the sd_event action again with the new template and mapping.