Suggestion: Issue warning when user deletes Pop-up list item
 

You may incur unwanted effects by deleting a pop-up list entry (in the Column Type section of the Inspector). Neither the user guide nor the pop-up list editor warns that, upon deleting a pop-up list entry, OmniOutliner removes all occurrences of that string from the column. Makes sense, but if you're unawares the penalty is potentially steep.

Granted, a warning every for every delete could be cumbersome, but perhaps post an initial warning and a "don't remind" option ... or a checkbox toggle the warning on or off.

qomni