Security issue with data import role

Hi everyone

I am facing an issue when I try to import data (leads) with a custom data import security role. In the import wizard I get an error (record is unavailable) when it comes to choose the entity wich I want to import (see the screenshots).

When I look into the trace file I see the three exceptions you can also find in the screenshot (and which you cannot set in a security role). The third screenshot shows the data import security role. With the systemadministrator role I can import leads without any problem.

Does anybody know the cause of this issue?

Thanks in advance!