Person change display pattern impact on ITShop Portal

Hi

We have changed the display pattern on the table person to %CCC_DisplayName%.
That works fine so far, but we are facing now some problems in ITShop.

If request properties ask for selecting a person, the list in the popup to select the new owner is empty.

After click on "Reset view" in "View settings" all the persons are displayed.

I have already tried to restart AppServer and Portal with deleting the cache folders, but it doesn't work.
Also executing additional compiles, ... didn't work as well.

Any idea? What should I try to get it solved?

Patrick

PS: If I change back the display pattern back to %InternalName% (%CentralAccount%) it works perfectly.