@tibor.pacalat: I can safely reproduce this. Please assign to a developer, should be a simply fix. Thanks!

The XML structure is fine. The text is not saved properly in the LSS, probably because it was not properly saved in the original survey.
The character < needs to be quoted in HTML to work properly.
On import this looks like invalid HTML which is then removed most likely by the XSS fiter.

Not a bug.

We must test the whole process as superadministrator and whole process as simple administrator

@c_schmitz, I get your point. And though this doesn't seem to be an import issues, it is still an issue if "<" is not escaped properly when saving the question text. So I'd prefer to keep this open and adjust the issue description, because the issue is there!

The superadmin can import this just fine (I tested this) -for a normal admin this gets filtered.
So, this is exactly the way it should be.

@Mazi Please test properly before reporting an issue.

@c_schmitz, I just double checked and impoorted the attached LSS file at version 6.15.21 with the main superadmin user set up when installing the system.
Filter HTML for XSS is OFF
Disable question script for XSS restricted user is OFF

When checking question with code q506 and the FR logic file I still do see the empty entry for SQ003 as shown at the provided screenshot.

The logic view does not show it since it is invalid HTML.
Check it out, it is imported properly. If you check the question in the question editor the (invalid) subquestion content is there.

c_schmitz, indeed - you are totally right. Will double check at the customer system.