Importing a process template from RMC

Hi,

I have created a new work item template that I exported from RMC. When trying to import this into RTC, I get the following warning:
The template contains references to repository items and should neither be used with other repositories nor in a process template.

The wizard allows me to continue. Once the import is done and I want to add it as a template in RTC by editing the process template, the template gives me a circle with a cross inside. It also gives me an error message:
The template has an invalid specification of work items and cannot be used

What am I doing wrong? I can give more info if needed.

Regards
Johan