Making a wikitext field mandatory via UI Policy causes the javascript error "Cannot read property 'removeClassName' of undefined" - Known Error

Making a wikitext field mandatory via UI Policy causes the javascript error "Cannot read property 'removeClassName' of undefined" Description When trying to make a wikitext field mandatory via a UI Policy, the javascript error "Cannot read property 'removeClassName' of undefined" is generated.

Steps to Reproduce

1 - Go to kb_knowledge.list 2 - Choose any knowledge article 3 - Right click choose configure > all 4 - Disable all the UI Policies 5 - Create a new UI Policy 6 - Create a new UI Policy Action that makes the wiki field mandatory 7 - Save 8 - Go to any knowledge article

Notice the javascript error in the browser console: Cannot read property 'removeClassName' of undefined kb_knowledge.do:90 +-- Parse times

Workaround After carefully considering the severity and frequency of the issue, and the cost and risk of attempting a fix, it has been decided to not address this issue in any current or near future releases. We do not make this decision lightly, and we apologise for any inconvenience.

As a workaround, use a Client Script instead of a UI Policy.