You noticed that while editing a custom Data Class:
Clicking on "Browse URL" button causes an error:
"Please select the item Reference cell you wish to lookup"
You were using Chrome browser.
Steps to duplicate issue:
ITMS 8.5 RU3, RU4
Known issue
A fix for this has been added to our ITMS 8.6 Release.
Current workaround:
Note: After applying "MultiRowDataClassControl.js", you need to clear browsing data and restart Chrome browser to make new .js working.